Smoking is much more common in adults with mental illness than other adults Smokers who quit have immediate health benefits
doi: 10.1016/j.jegh.2016.07.001
Overall, we found comparable proportions of similarity between friends on the smoking/vaping outcomes were due to selection homophily and peer influence

Tobacco use is currently the leading worldwide cause of preventable death Worldwide, over 1.1 billion people are smokers Estimated that 34 million adults in US are current cigarette smokers For the first time in over 20 years there has been a rise in cigarette sales Tobacco kills up to half of its users 7 million first-hand smoking deaths per year 1.2 million from second-hand smoke The highest smoking rates are people ages 25-44 and 45-64 years old Approximately 90% of all smokers start before age 18 Nearly 14% of adults in the US aged 18 years or older smoked cigarettes in 2018 Other than health risks, finances are among the most motivating reasons for smokers to quit On average, about 50% of current smokers smoke one pack or more in a typical day, spending ~$14 per pack of cigarettes Smoking-related illness in the United States costs more than $300 billion each year Nearly $170 billion for direct medical care for adults More than $156 billion in lost productivity Health Risks of Smoking Smoking is a significant risk factor for cancer, heart disease, stroke, lung diseases, diabetes, chronic obstructive pulmonary disease (COPD), rheumatoid arthritis, and reduced male and female fertility

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