Your post is irresponsible.
Antismoking "science" is a big bucks making scam. Parroting their propaganda is either ignorant or evil (pick which one is your comment).
If you check the 3 discussion threads linked above, you will discover that the two "smart drugs" forums, with dozens of medical & biochemical experts (grad students, researchers, lots of bright folks), all very eager to "inform" me about the science of tobacco smoke, could not produce a single scientific fact supporting their antismoking position which could hold upon closer inspection.
In contrast, the scientific facts (and papers backing them up) I brought up were a complete shock to them and after weeks of trying they could not produce anything to refute them. In fact some of these health fanatics took up smoking as result of the discussion. Even the initially strongly antismoking moderator, after following up my citations and checking out anything he could find came back few weeks after the discussion ended, admitting he was left "scratching his head" since all the hard science(experiments, randomized trials) on the effects of tobacco smoke (in contrast to "junk" science, which was all he knew about it before the discussion) agree with my position.
Smoking is not just good for you, but it is the best single habit you can take up for your health and longevity. Of course, I am talking about the ancient medicinal plant, the plain old tobacco leaf -- 'the most precious gift of gods' to humans, not about the supermarket junk cigarettes, such as Marlboro... which are not even made from tobacco leaf (but from additive laden "tobacco sheets", including toxic fire retardants e.g. see "Fire Safe Cigarettes" mandated now in most states). You can still get the real thing, and save money in the process, if you "roll your own".