I can honostly say that I've never seen a deer while I was smoking a cigarette, while hunting. I've seen them immediately after putting one out. I've seen a lot of deer both during smoking hunts and non smoking hunts and I've been skunked at both as well.

I think the non-smoker will have an advantage over the smoker when it comes to scent control - all other things being equal. However, I'm confident enough in my setups that I allow myself to smoke at certain times/conditions while hunting.

Read my post about a monster buck encounter yesterday in Team 4's contest thread - I had just put a cigarette out when all this happened.