This is a tricky one, because it will always raise the notion of personal freedom and responsibility.
It's intriguing that as a culture, we have allowed the growth and massive profits of selling a product that, if used for its intended purpose, could kill you.
I personally don't subscibe to the "I can kill myself if I want to ,,," argument, becuase sometimes, society has to be protected from the stupid things it would do if it was not prevnted from doing so.
My belief is the twin changes we see coming through - the anti-social responses to smoking, coupled with the cost increases, are going to see an undesirable and unhelthy habit die out of its own accord.