Tobacco Smokers: Why still smoke ?

So back 60, 50, even 20 years ago we as a society were much less aware of all the health risks associated with smoking, and you see those movies with people smoking in the waiting room of the doctor’s office and whatnot. But it just seems like in today’s day and age, don’t we know better? There are so many people (artists, actors, writers, hipsters, etc) who are still smoking, even though there’s SO much evidence that it’s just bad for you. In a lot of metropolitan cities you can’t smoke in restaurants or bars. I just heard on the news that some colleges have banned smoking on campus. A few beaches have bans as well. What’s the point? Won’t it reach a point where it’s just too much of a hassle because you won’t be able to smoke anywhere? And if you smoke now, is it because you recently took it up, or because you started 15 years ago and can’t stop? If you smoke now, do you see yourself quitting anytime soon?