© 2002 American Public Health Association
Elena S. H. Yu and Sawsan Abdulrahim are with the Division of Epidemiology and Biostatistics, Graduate School of Public Health, San Diego State University, San Diego, Calif. Edwin H. Chen is with the Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago. Katherine K. Kim is with the Kirkhof School of Nursing, Grand Valley State University, Allendale, Mich. Correspondence: Requests for reprints should be sent to Elena S.H. Yu, PhD, MPH, Division of Epidemiology and Biostatistics, School of Public Health, San Diego State University, San Diego, CA 92182 (e-mail: eyu{at}mail.sdsu.edu).
Objectives. This report describes and examines factors significantly associated with smoking among Chinese Americans, using multiple logistic regression methods. Methods. We conducted a population-based survey (n = 644, age = 4069 years) in Chicago's Chinatown using a Chinese questionnaire based on the National Health Interview Survey (NHIS). Results. Smoking prevalence was 34% for males and 2% for females. Some 93% of current smokers had smoked regularly for 10 or more years. Low education (odds ratio [OR] = 2.41; 95% confidence interval [CI] = 1.31, 4.46), use of a non-Western physician or clinic for health care (OR = 2.64; 95% CI = 1.46, 4.80), and no knowledge of early cancer warning signs and symptoms (OR = 2.52; 95% CI = 1.35, 4.70) were significantly associated with smoking among men. Conclusions. The male prevalence of smoking is higher than those reported in California, the NHIS, and the Behavioral Risk Factor Surveillance System (BRFSS); exceeds the rate for African Americans aged 18 years and older; is comparable with the rate for African American males aged 45 to 64 years; and is far above the Healthy People 2010 target goal of less than 12%. Multisite surveys and smoking cessation campaigns in Chinese are needed.
Each year, 4 million deathsnearly equally divided between developed and developing countriesare attributable to smoking.1 China alone has almost a million smoking-associated deaths per year,2,3 while in the United States the figure is 430 000,4 estimated to exceed deaths due to AIDS, car accidents, alcohol, suicides, homicides, firearms, and illegal drugs combined.5 Overall, in developed nations, tobacco use contributes to the death of about one third of those aged 35 to 69 years,1 resulting in a premature loss of 20 to 25 years of life.1,6,7 Cigarette-smoking status and patterns of use among adults in the United States have been systematically monitored through programmatic surveys,811 analysis of birth certificates,12 and funded research. The National Health Interview Survey (NHIS) derives annual estimates of health characteristics (including smoking status) through a probability sample of noninstitutionalized civilian adults,8 while the Behavioral Risk Factor Surveillance System (BRFSS) provides state-based estimates of cigarette users among persons aged 18 years and older living in the 50 states and the District of Columbia.4 However, data are limited for Asian Americans and Pacific Islanders (AAPIs), now counted at more than 11 million8,13the fastest-growing ethnic minority group in the United States. The Surgeon General's Report of 1998 is the latest nationwide review of the diverse tobacco control needs of major racial/ethnic minority groups, including AAPIs.14 The information conveyed by the aggregation of numbers masks important subgroup and regional differences. An understanding of the heterogeneity of cigarette use among AAPI subpopulations is crucial for the formulation of useful health policies and the development of sound intervention programs. The objectives of this report are to describe smoking behavior, knowledge, and beliefs among Chinese Americans and to better understand the factors associated with their knowledge and continuing use of cigarettes despite the known harmful effects. In prevalence studies, "current smoking" (or cigarette use) is defined as having smoked at least 100 cigarettes in one's lifetime and currently smoking. The prevalence of cigarette use in China has been reported to be 33.8% for both sexes,1517 61% for men aged 15 years and older,1,3,7 and 73% for men aged 40 years and older.3 Three fifths of Chinese male smokers started smoking at 15 to 20 years of age.15 The target goal in China is to reduce the smoking rate for men aged 15 years and older to below 58%.18 Obviously, the smoking epidemic in China is on a different order of magnitude than that found in the United States today, where the goal for 2010 is to reduce the prevalence of smoking to less than 12%.19 For the general US population aged 18 years and older, the prevalence of cigarette smoking has declined from 29% in 198720 to 26% in 199421 and 24.7% in 1997.11 Although data on smoking are available from BRFSS and NHIS interviews conducted in English, the small sample size of AAPIs has hampered precise estimates. Researchers often have to pool data sets across years or concatenate disparate samples from different locations in order to obtain crude estimates for AAPIs, as was done in the Surgeon General's Report on tobacco use in 1998.14 The report showed a smoking rate for AAPIs of 23.8% from 1978 to 1980, which dropped to 15.3% in the period 1994 to 1995,14,21 only to increase to 16.9% in 1997.11 These results differ from that based on a recent BRFSS survey of AAPIs in the 10 states where they are most populous; this revealed a smoking prevalence of 10.7%,22 with sevenfold variation by state (4.7% in Maryland, 36.1% in Oregon). The sample size was too small to produce meaningful statistics for AAPI subpopulations, but studies in several localities showed heterogeneous smoking prevalence for different subgroups, ranging from 9.1% among Chinese Americans23 to 23.1% among Southeast Asians.24 Nearly 1 of every 4 AAPIs is of Chinese descent. Despite the high prevalence of tobacco use in China and the fact that the overwhelming majority (83%) of Chinese Americans aged 18 years and older are foreign born,25 the smoking prevalence reported for Chinese Americans is lowbetween 9.1% and 10.9%.23,25,26 Below, we review some important factors that have been reported to be associated with cigarette use among AAPIs and, specifically, Chinese Americans.
Some 27.6% of men and 22.1% of women in the United States are current smokers.11 Among AAPIs, population-based estimates mask a two- to fivefold sex differencefrom 32.5% for men vs 14.7% for women in the 19781980 NHIS to 25.1% for men vs 5.8% for women in the 19941995 NHIS.14 Reported rates of smoking among AAPI men include 32.8% for Cambodians,24 38.5% for Koreans,27 39% for Chinese,28 41.7% for Vietnamese, and 51.2% for Laotians.24 Intragroup sex variation is especially dramatic for Chinese Americans28.1% for men vs 1.2% for women in Oakland29 and 16.5% for men vs 2.6% for women in San Francisco.23
NHIS trend data show that smoking tends to be higher among persons younger than 55 years and lower among older adults. Prevalence tends to be highest in the 25- to 44-year age group for the general US population, AAPIs, and Chinese.14 However, among Chinese men in California, only a minimal age difference in smoking prevalence exists for persons aged 25 years and older.14,30
Cross-sectional surveys in the United States have established an inverse relationship between education level and smoking.14,3032 Data from China have shown a similar gradient (43% prevalence among the college educated, 53% for high school graduates, 68% for illiterates).33 In the United States, an inverse association in the prevalence of smoking among AAPIs by level of education was reported in the California survey.14,31 Data on AAPIs from the 19941995 NHIS, however, do not strongly support the inverse association between education and smoking prevalence (less than high school education, 13.3% prevalence; education beyond high school, 14.4% prevalence), and in the 19891991 Oakland BRFSS survey the association is inconsistent, with no smokers at the "some college" level.14,29
Among immigrants, the ability to speak English varies inconsistently with smoking status.32,34 The 19901991 BRFSS in California found that 31.8% of Chinese not fluent in English were smokers, a rate somewhat lower than that found for Vietnamese (36.6%).29 Just how strongly associated spoken English fluency is with smoking among Chinese Americans living outside of California remains to be studied.
Lack of access to mainstream health care systems has been a problem for underserved populations. Low smoking prevalence has been reported from an analysis of patients at the Kaiser Permanente Health Plan in California,26,31 but past studies on Chinese American smoking23,24 did not examine the net effect of source of care.
Studies on Chinese American smoking behavior have apparently not examined the association between smoking status and early cancer warning signs and symptoms (i.e., change in bowel or bladder habits, a sore that does not heal, unusual bleeding or discharge, thickening or lump in breast or elsewhere, indigestion or difficulty swallowing, obvious change in wart or mole, nagging cough or hoarseness). We examined them as part of our objectives.
Sample This study is part of a larger Asian American Cancer Control Developmental Project.27,35 A list of Chicago's Chinatown residents was generated by merging several files, including compiled surnames, telephone directories, and Chinese newspaper subscribers. A 2-stage probability sampling method was used to randomly select Chinese households from the defined sampling frame.36 Of all eligible individuals enumerated by telephone, one person from each household was randomly selected for an interview. Eligibility was defined by age (4069 years), selfclassified ethnicity (Chinese), and residence within the defined boundary of Chinatown. Budgetary constraints restricted eligibility criteria to the age group most likely to benefit from the use of cancer screening tests.
Instrument
Data Collection
Statistical analysis was performed with SAS (SAS Institute Inc, Cary, NC) and SPSS (SPSS Inc, Chicago, Ill). Group differences were compared by
Sample Characteristics A total of 644 Chinese completed the survey, representing a response rate of 80%. Sex differences by age were minimal but quite substantial in terms of education (Table 1
Comparison With NHIS Data We compared our findings with those reported for the general US population in the 1997 NHIS11 using comparable criteria of defining smoking status (Table 2
Smoking Behavior of Chinese Males The percentage of Chinese American men who had smoked a pipe or cigar at least 50 times in their lifetime was 11% and 3%, respectively. Only 1 man was a current pipe smoker; 2 were current cigar smokers. Five percent of Chinese men had used chewing tobacco at least 20 times in their lifetime; only 2 were current chewers. Three persons reported that they had used snuff or betel nut (another addictive substance commonly used in Asia) at least 20 times in their lives and were still using them. Betel nut is the fruit of Areca catechu; it is usually sprinkled with calcium oxide, salt, and powdered root of liquorice and served wrapped in a tobacco leaf, which is chewed and then spat out. On average, current smokers started smoking at 19 years of age (former smokers at 19.9 years). For current and former smokers combined, the starting age ranged from 7 to 52 years (median = 18.5). The most common reasons given for smoking (multiple responses allowed) were habit (40%), addiction (36%), enjoyment (14%), and social functions (11%). Among the current smokers, 93% had smoked cigarettes regularly for more than 10 years; only 5% had smoked for 10 years or less. About 39% of the smokers reported lighting up a cigarette immediately after awakening, 28% within an hour of awakening, and 25% within 1 to 5 hours of waking up. Marlboro (29.5%) and Viceroy (25.7%), followed by Winston (14.3%) and Kent (12.4%), were the preferred brands; some 4.8% smoked the brand 555 and 3.8% reported having no brand loyalty. Smokers tended to favor nonmentholated (93.3%), filter-tipped (97.1%), and soft-pack (79%) cigarettes. Preference for regular-size cigarettes ran high (83.8%). Most popular were regular cigarettes (61%), followed by light cigarettes (36.2%). Some (44%) smoked half a pack to a pack of cigarettes a day, and 42% smoked less than half a pack a day.
Quitting Attempts
Contrast Between Never and Current Smokers
Factors Associated With Smoking Status We used multiple logistic regression analysis to evaluate the effects of selected independent variables on smoking status (current vs never), after adjusting for the presence of other variables considered important from our literature review. Age, education, spoken English fluency, years in the United States, usual source of care, and knowledge of early cancer warning signs and symptoms were dichotomized. Only education, usual source of care, and knowledge of early cancer warning signs and symptoms were statistically significant when stepwise selection using loglikelihood criteria was applied (Table 4
Our final model indicates that Chinese American men with less than an elementary school education were more than twice as likely as those with a higher level of education to be current smokers, after the effects of usual source of health care and knowledge of cancer signs and symptoms are taken into consideration (odds ratio [OR] = 2.41; 95% confidence interval [CI] = 1.31, 4.46). Likewise, those who did not use clinics or a Western physician's office for their usual source of health care were more than twice as likely to be current smokers, other things equal (OR = 2.64; 95% CI = 1.46, 4.80). The magnitude of effect was similar for knowledge of early cancer warning signs and symptoms, after the other 2 variables were controlled for (OR = 2.52; 95% CI = 1.35, 4.70).
Smoking and Alcohol Use
Knowledge of Smoking and Major Diseases
Beliefs About Smoking
Useful Sources of Information
Several of our findings are noteworthy. First, previous studies have reported low smoking prevalence for Chinese Americans, befitting the image of a "model minority."38 In reality, their rates vary considerably by nativity, location, and other factors. Our study shows a smoking prevalence for men that is between the low rates reported for Chinese aged 18 years and older12,14,23,30 and the high rate reported for Chinese men aged 60 to 96 years.28 The prevalence is not quite half of what is found in China. By US norms, the smoking prevalence of the Chinese American men in our study is high; it exceeds the reported rates for the last decade among African American men aged 18 years and older8,11,14 and is comparable to the rate (39.4%) found for African American men aged 45 to 64 years in the 1997 NHIS.8,11 Current smoking prevalence among Chicago's Chinatown Chinese men aged 40 to 69 years is more than double the desired Healthy People 2010 target goal of less than 12%. Second, age and cohort effects are confounded in the variation of smoking status by age. Since the overwhelming majority of older Chinese are foreign-born nonEnglish speakers, their smoking prevalence is higher than the rate reported for younger cohorts of English-speaking, mostly US-born, Chinese Americans who respond to BRFSS telephone interviews. Studies with extraordinarily large samples are needed to monitor the smoking prevalence of different age cohorts by nativity. Third, the following methodological differences between our study and others most likely contributed to the differences in the results: (a) we conducted a population-based survey in Chinatown; (b) we sampled adults aged 40 to 69 years; (c) we met face-to-face, not over the telephone, with interviewees; (d) we interviewed in Chinese languages; (e) our survey instrument was standardizedthe kind and number of explanations provided to the respondents were rehearsed during training. Clearly, replication studies are very much needed. However, in designing intervention programs, some thought should be given to the immediately controllable factors (source of health care and knowledge of early cancer warning signs and symptoms). Smokers and the community at large can benefit from the establishment of smoking cessation programs in Chinese languages. Except for the NHIS and the BRFSS, which surveyed mostly English-speaking AAPIs, we have found only 2 population-based studies aimed at estimating tobacco use among Chinese Americans, both conducted in California. 23,29 Given the geographic variability in immigrant compositions, coordinated multisite, large-sample surveys of smoking focused on Chinese Americansthe largest subgroup in the AAPI communityin states or areas where they are most populous is necessary to obtain precise estimates of smoking prevalence, health risks, and health status. Proclaimed as the single most preventable and controllable factor in morbidity and mortality reduction,39 smoking is one of the important risk factors or causal agents in at least 6 of the top 10 leading causes of death for the nationheart diseases, cancer, cerebrovascular diseases, chronic obstructive pulmonary diseases, diabetes mellitus, and atherosclerosis, which together account for 69.7% of all deaths.40 Among Chinese Americans, heart disease and cancer combined account for 58.3% of all deaths. Cerebrovascular diseases add another 8.4%, bringing the total proportional mortality from tobacco-related deaths for just the 3 leading causes of death up to 66.7%. In the 25- to 64-year age range, cancer is the leading cause of death for Chinese Americans,41 and cancer of the lung and bronchus is the leading cause of cancer deaths for all ages. Hence, even a small decline in smoking prevalence among Chinese Americans will have a significant beneficial public health impact in reducing morbidity and mortality among AAPIs.
This is the first population-based study of Chinese American smoking behavior, knowledge, and beliefs, conducted in Chinese and using a standardized instrument that mirrors the NHIS format, to be implemented outside of California. We found that the overall smoking prevalence in our sample of Chicago Chinatown Chinese aged 40 to 69 years was 17.4% (men, 34%; women, 2%). Results of multiple logistic regression analyses show that the 3 major variables significantly associated with smoking status were education, usual source of health care, and knowledge of early cancer warning signs and symptoms. After these 3 variables were adjusted for, factors identified as important in previous studies (i.e., age, spoken English fluency, and years in the United States) were not significantly associated with being a current smoker. Moreover, nearly half of the current smokers had already been advised by their physicians to stop smoking. "Cold turkey" was the most common quitting method. Future plans for multisite studies on smoking and health should include the development of Chinese-language instruments and interventions for Chinese-speaking Chinese Americans.
The study was supported by National Cancer Institute grant RO1 CA 49569. We thank P. S. Levy for technical advice on sampling and W. T. Liu for translation assistance. We owe a debt of gratitude to our respondents, bilingual interviewers, project staff, and innumerable community leaders.
The Chinese American substudy of the project was conceptualized, designed, and implemented by E. S. H. Yu with the collaboration of E. H. Chen. E. S. H. Yu led the writing of the paper with statistical support from E. H. Chen. K. K. Kim contributed to some aspects of the study and the writing of the paper. S. Abdulrahim performed preliminary analysis on the entire sample, examined the consistency of the responses, and explored factors for smoking behavior. Accepted for publication February 23, 2001.
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