Ahhhh... I am not that sanguine on modern usage of tobacco. It was, interestingly enough, used for religious worship purposes by American Indians. Get in touch with God — smoke a cigarette? The Indians did better at that (at least with respect to what they believed was God) than we Christianized Westerners do. Outside of the lodge or wherever the peace pipe was smoked, they did not keep on puffing the stuff.
I think the modern use of tobacco was very beneficial. Someday we will understand the productivity boost from tobacco (in terms of improving personal productivity, not just as an article of trade) was very important in creating modern industrial society.