**6. Prevention and public health**

Various factors influence the uptake of smoking at the population level as well as individual. Therefore, it is important to set preventive strategies to control the harm of smoking on a public level as well as an individual because the motivation of people to quit smoking is different from smokers with mental illnesses. Public health strategies for decreasing smoking among people with mental illness should start to integrate population-based strategies to lower the onset of smoking because most tobacco users initiate smoking at younger ages [51]. Many of these tobacco control strategies at the population level may contribute to smoking prevention at a national level as well as a particular population or individual level [6, 51]. Although servicedbased smoking cessation tends to be ineffective for a high rate of people with mental illness due to lack of contact with the service, the effort to improve smoking cessation in patients with mental illness is significant [8]. However, population-based strategies are successful for smoking control, including, smoking-free policy, media campaigns, age, smoking prevalence among friends, the price of tobacco, and others.
