About 18.2% of the U.S. adult population smokes, down from over 40% half a century ago. 
 
 Despite the dramatic decline, smoking is the leading cause of preventable death in the United States. Each year, tobacco consumption kills nearly half a million Americans, and another 16 million are currently living with a disease caused by smoking. 
 
 Though no major U.S. metro area tops the nationwide smoking rate of 50 years ago, there are several cities where more than one in five adult residents report a smoking habit. 24/7 Wall St. reviewed Gallup poll data to identify the U.S. metro areas with the highest smoking rates. In a handful of cities, the smoking rate tops 25%. 
 
 Click here to see the cities where the most people smoke. 
 
 Click here to see the detailed findings and methodology. ||||| Older smokers are usually more set in their ways, but a dollar increase in cigarette prices makes them 20 percent more likely to quit, a new Drexel University study found. 
 
 The study, published in Epidemiology, used 10 years of neighborhood-level price data to determine how it affected nearby smokers, focusing on those who skewed older. 
 
 “Older adult smokers have been smoking for a long time and tend to have lower rates of smoking cessation compared to younger populations, suggesting deeply entrenched behavior that is difficult to change,” said Stephanie Mayne, PhD, the lead author of the study who is a former doctoral student at Drexel and now a fellow at Northwestern. “Our finding that increases in cigarette prices were associated with quitting smoking in the older population suggests that cigarette taxes may be a particularly effective lever for behavior change.” 
 
 Taking a look at the local relationship between smoking habits and cigarette prices is an understudied but important area to look at, according to the senior author on the study, Amy Auchincloss, PhD, associate professor in the Dornsife School of Public Health. 
 
 “Results on this topic primarily have come from population surveillance,” she said. “But we had neighborhood tobacco price data and could link that to a cohort of individuals who were followed for about 10 years.” 
 
 Smoking cessation remains an important focus of public health efforts since it remains the largest preventable cause of death and disease in not just the United States, but the world. 
 
 The cohort Mayne and Auchincloss looked at included smokers ranging in age from 44 to 84 and stretched across six different places, including the Bronx, Chicago, and the county containing Winston-Salem, North Carolina. Data were taken from the study population between 2002 and 2012 as a part of the Multi-Ethnic Study of Artherosclerosis (MESA). 
 
 In addition to finding that current smokers were 20 percent more likely to quit smoking when pack prices went up by a dollar, Mayne and Auchincloss’ team showed that there was a 3 percent overall reduction in smoking risk. 
 
 However, when the data was narrowed to heavy smokers (defined as smoking more than half a pack a day), there was a 7 percent reduction in risk. When prices increased by a dollar, heavy smokers also showed a 35 percent reduction in the average number of cigarettes they smoked per day, compared to 19 percent less in the overall smoking population. 
 
 “Since heavy smokers smoke more cigarettes per day initially, they may feel the impact of a price increase to a greater degree and be more likely to cut back on the number of cigarettes they smoke on a daily basis,” Mayne said. 
 
 While the data focused on a population older than 44, Mayne believes the price effect may be “similar or possibly stronger in a younger population.” 
 
 “Some research suggests younger adults may be more price-sensitive than older adults,” she pointed out. 
 
 Something she found, though, was that smoking bans in bars and restaurants did not appear to have any effect on smoking behavior in the study population. Although more research is likely necessary to see why that is and whether it’s true — Mayne will soon publish a study devoted to that — one possible explanation is that the economic pressures of a cigarette price increase provide a stronger incentive to quit than placing limits on smoking in public places. 
 
 Mark Stehr, PhD, an associate professor in Drexel's School of Economics who also served as a co-author on the study, also had a thought on the bans' effect. 
 
 "A ban may be circumvented by going outside or staying home, whereas avoiding a price increase might take more effort," he pointed out. 
 
 Based on results from this study, raising cigarette prices appears to be a better strategy for encouraging smoking cessation across older ages. 
 
 “More consistent tax policy across the United States might help encourage more older adults to quit smoking,” Mayne said. 
 
 “Given our findings, if an additional one dollar was added to the U.S. tobacco tax, it could amount to upwards of one million fewer smokers,” Auchincloss said. “Short of federal taxes, raising state and local taxes and creating minimum price thresholds for tobacco should be essential components of a comprehensive tobacco control strategy - particularly in places with high tobacco prevalence. 
 
 The study, “Longitudinal Associations of Local Cigarette Prices and Smoking Bans with Smoking Behavior in the Multi-Ethnic Study of Atherosclerosis (MESA),” was also co-authored by Ana Diez Roux, MD, PhD, dean, and Yvonne Michael, ScD, associate dean and associate professor, and David Kern, PhD, all of the Dornsife School of Public Health; Ana Navas-Acien, PhD, of Columbia University; and Joel Kaufman, MD, of the University of Washington.
– In the past 50 years, the US smoking rate has fallen from 40% to about 18%. That suggests the habit and the health problems associated with it are easing, yet more than a quarter of residents still smoke in some US cities. The US metropolitan areas (none of them major ones) with the highest smoking rates, per 24/7 Wall St.: Fort Smith, Ark.-Okla.: 28.3% Lafayette, La.: 28.3% Erie, Pa.: 28.2% Kingsport-Bristol-Bristol, Tenn.-Va.: 28% Fayetteville, NC: 27.8% Spartanburg, SC: 27.6% Canton-Massillon, Ohio: 27.5% Huntington-Ashland, W. Va.-Ky.-Ohio: 27.2% Hickory-Lenoir-Morganton, NC: 25.4% Winston-Salem, NC: 25% Click for the full list or see the US cities with the worst diets.