Sanji happens to be one of my favourite characters in One Piece. I'm not overly fond of smokers, but if you consider the time frame of when pirates roam freely -- it would make sense for some to smoke.
Now I'm not encouraging it or anything, since I've become allergic and want to puke every time I smell it -- simply stating while Sanji DOES smoke, there's a possible reason. Also because he's a manga character with some rad cooking skills and awesome moves.
That aside, I congratulate all that stop smoking. And AWESOME job here Vashperado!