I have sat in the smoke around a campfire intentionally since I saw African bushmen doing it. They burn elephant dung and sit in the smoke. They are better hunters than most of us can ever hope to be, so I figured it couldn't hurt.
On another note, I have a buddy that has had to put down his cigarette twice to shoot deer. He tagged two does from about 10 to 15 yds on diferent occasions WHILE smoking a cigarette in the woods. He has also shot about a dozen more deer smelling like a stale cigarette without any scent blocker or cover scent. Go figure..there is something to say for luck.
I sit in the smoke, always play the wind and spray my boots or step in a puddle...other than that nothing special and I have had a number of deer at tripping distance.
Just do what works for you.
Your results may vary,
-Charlie
**Have you guys ever seen the incense sticks you burn that are used to attract deer? They supposedly work. Too much crap to keep up with, just grab your bow and hunt.