Tobacco can be grown in gardens, it's just harder to make cigarettes from the naturally-grown leaves without all the additives. I do know a couple of people who grow their own and roll their own, but that takes work.

That said, I'm a non-smoker because it makes me sick. I've also had a smoking musician tell me that I'd never make it as a musician because I'm allergic to smoke. So every time a venue goes non-smoking, I rejoice, because that's one more venue closer to being able to perform live.