Decrease in Smoking Prevalence --- Minnesota, 1999--2010

Decrease in Smoking Prevalence --- Minnesota, 1999--2010
Weekly
February 11, 2011 / 60(05);138-141





Following the landmark 1998 settlement of the lawsuit, State of Minnesota versus Philip Morris, Inc., et al., Minnesota implemented a series of tobacco control efforts to limit the harm caused by tobacco use. In 2001, quitline services for tobacco users without health insurance coverage for cessation services were introduced and statewide mass media campaigns publicizing them were initiated. In 2005, Minnesota imposed a $0.75 per pack tax on cigarettes, followed in 2009 by a $0.62 per pack increase in federal excise tax, contributing in large part to a more than $2 increase in the average price of cigarettes (1). In 2007, a comprehensive, statewide smoke-free law was passed. Using surveillance data from the Minnesota Adult Tobacco Survey (MATS) and cigarette pack sales data, this report examines the effects of these tobacco-related public health efforts. Compared with a 15% decline in national adult smoking prevalence since 1999, adult smoking prevalence in Minnesota decreased 27.1%, from 22.1% in 1999 to 16.1% in 2010. During the same period, per capita cigarette sales in Minnesota decreased 40%. In addition, in 2010 compared with 1999, a higher percentage of adults reported that smoking was restricted in their homes (87.2% versus 64.5%), and adults were less likely to report exposure to secondhand smoke (45.6% versus 67.2%). In the past decade, Minnesota has benefited from sustained tobacco control. Future progress in decreasing adult smoking and reducing exposure to secondhand smoke will depend on a concerted effort across the public health community to keep tobacco control a priority.

MATS is a telephone survey designed to collect data about tobacco use and attitudes from a representative sample of the entire civilian, noninstitutionalized adult population in Minnesota.* MATS was implemented in 1999 to measure the effects of tobacco-related policies and programs by monitoring trends in the use of tobacco products in the state. The fourth survey in this ongoing surveillance initiative was completed in 2010. Prior surveys were conducted in 1999, 2003, and 2007.

MATS uses rigorous survey methods, including computer-assisted telephone interviewing, consistent core questions, random-digit--dialing (RDD) sampling, and survey weighting based on available characteristics of the adult Minnesota population. MATS 2010 used a list-assisted RDD sampling method based on two statewide sample frames: all possible landline telephone numbers and all possible cellular telephone numbers. The sample design called for an adult to be selected at random from each household identified through the RDD screening process.

Several communications methods were used before and during data collection for the MATS 2010 sample. These included letters, an informational website, and contact numbers that potential respondents could call for information. These tools were designed to improve response rates and provide information about the survey. Consistent with other large-scale, telephone-based surveys, MATS telephone interviewers made a second attempt to secure cooperation by recontacting persons who initially declined to participate in the survey.

For the 2010 survey, 5,555 landline and 1,502 cellular telephone interviews were completed, for a total sample of 7,057 interviews. Based on American Association for Public Opinion Research methodology, the weighted landline and cellular telephone response rates were 45.0% and 44.5%, respectively, which reflect net response rates across both the prescreening eligibility questionnaire and MATS questionnaire. The Minnesota Department of Health Institutional Review Board reviewed and approved the MATS questionnaire, data collection, and data security procedures.

For the surveys, an adult current smoker was defined as a person aged ≥18 years who had smoked ≥100 cigarettes and currently smoked every day or some days. Those smokers were asked to estimate how many cigarettes they smoked. Heavy smoking was defined as ≥25 cigarettes per day, moderate smoking as 16--24 cigarettes per day, and light smoking as ≤15 cigarettes per day. To assess exposure to secondhand smoke, participants were asked several questions to determine whether, in the past 7 days, anyone had smoked near them in their workplace, car, home, or another location. In addition, MATS participants were asked to choose the statement that best described rules they follow about smoking inside their home. Smoking was either allowed anywhere, allowed in some places, or not allowed. Cigarette sales data were obtained from an annual compendium on tobacco revenue and statistics (1). Per capita consumption was calculated for both Minnesota and nationally for the years 1999 to 2009 by dividing the annual number of packs sold by the total population of Minnesota and the national population. National consumption calculations excluded cigarette sales in Minnesota. National smoking prevalence estimates were from the National Health Interview Survey (2).†

Based on MATS data, Minnesota adult smoking prevalence declined steadily from 22.1% in 1999 to 16.1% in 2010, a 27.1% decrease (Figure 1). The rate of decline was greatest during 1999--2003. During 2007--2010, smoking prevalence declined from 17.0% to 16.1%. By comparison, cigarette smoking declined nationally from 23.3% in 1999 to 19.9% in 2010. However, the national rate remained essentially unchanged from 2004 to 2010 (2).

Significant (p<0.05) changes in smoking behavior also occurred in Minnesota during the past decade, based on t tests and chi-square tests. The daily average number of cigarettes smoked by current smokers decreased from 14.3 in 1999 to 12.2 in 2010. In addition, the proportion of current smokers who smoked ≥25 cigarettes per day decreased steadily, from 14.3% in 1999 to 6.3% in 2010 (Figure 2). From 2007 to 2010, the proportion of current smokers who smoked ≤15 cigarettes per day increased from 54.1% to 63.2%. The decrease in both smoking prevalence and cigarettes smoked per day corresponds with a decrease in sales of cigarettes. Per capita cigarette pack sales in Minnesota decreased 40% from 1999 to 2009 (Figure 3). Nationally, per capita cigarette pack sales have fallen steadily and, as of 2009, were 35% lower than in 1999. In addition, the percentage of Minnesota residents who reported that someone had smoked near them in the past 7 days in any location dropped steadily from 67.2% in 2003, before any large municipalities banned indoor smoking, to 56.7% just before the statewide ban, to 45.6% in 2010. In addition to the increase in smoke-free workplaces brought about by the statewide ban, more Minnesota residents reported smoke-free rules in their homes. In 2010, 87.2% reported that smoking was not allowed anywhere inside their home. This is a significant increase from 64.5% in 1999, and follows previous increases documented in 2003 (74.8%) and 2007 (83.2%). Reported by
RG Boyle, PhD, AW St. Claire, MPH, M Whittet, MPH, J D'Silva, MPH, JK Lee, PhD, ClearWay Minnesota, Minneapolis; AM Kinney, PhD, P Rode, MA, Minnesota Dept of Health.

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Decrease in Smoking Prevalence --- Minnesota, 1999--2010