When I was younger, I had a militant anti-smoker attitude. Probably partly because I had to endure long drives in a van filled with old women who would smoke most of the way, which is not okay by the way. But while I think that smoking near other people is incredibly rude, it also makes my eyes role to the degree in which smoking has become the cool thing to hate these days. I'm sure all these people going on a moral crusade against smoking, constantly lobbying for more sin-taxes, higher age barrier, more disturbing imagery on smokes packages et cetera, could better spend their time on a thousand other issues in our society, rather than trying to stop people making their own choices about what they put into their bodies.
Although, I guess controlling people's lifestyle choices is a priority for liberals, since the consequences of bad decisions are to the cost of the state in a socialised healthcare scheme, rather than to the individual making the bad decisions in the form of higher health insurance premiums.