Why does everyone vilify smokers?

I realize that smoking is bad for you, but there are a lot of things that people do that is bad for them and people around them, so why do people vilify smokers so much? There aren’t ads on TV to get people to stop drinking alcohol and people who smoke excessive amounts of pot think that cigarettes are disgusting. Why is this?

For the record, I am expecting a lot of backlash and nasty comments but I am still curious as to why everyone thinks it’s all right to hate this group of people.