people tend to judge too easily on first impressions. the things they do doesn't exactly mean they're a bad person. a person who smokes is it doing it deliberately to harm others, yet others look down on them as if that's their main purpose.
"In my contact with people I find that, as a rule, it is only the little, narrow people who live for themselves, who never read good books, who do not travel, who never open up their souls in a way to permit them to come into contact with other souls -- with the great outside world."
— Booker T. Washington, Up From Slavery