Answer: it stopped me from eating and fit with my oral fixation, k? Plus, as someone with chronic depression/anxiety issues, it worked as a mood stabilizer. And, once upon a time, I thought it looked cool. Also, at key points of my sexual development, the cigarette smoke smell was permanently linked in my memory positively, so I sometimes find the odor arousing. Lastly, after you've been doing it a while, it tastes good. I've also quit this past summer excepting moments of weakness at City and at camp-outs where I am waaaaaaaay drunk. And that's my honest answer.