Some people smoke because they have social functions. When that society is invited to pump some people may smoke because they believe that if it is not pumped into the group doesn't.
Some people smoke because the work to socialize. When a society that encourages smokers. Some people may be smoking I believe that if it is not included in the group did not.
Some people smoke because the work to socialize. When the society invites smoke. Some people may smoke, because I believe that if you don't smoke will group no.