I've used smoke for 3 years now with great success. Actually, I tried it thinking to prove it wouldn't work. However, after a few hunts and purposely hunting with the wind in the deers favor a few times and not getting busted, I became a believer.
I've still not been winded that I know of. Meaning, a deer could have winded me or moved away from my location that I was not aware of, but no deer I saw winded me.
I had a deer I could have spit on during the turkey season never show any signs of my presence.
I'm not suggesting anyone else try it based on that, as their are plenty of other methods deer hunters use, but Scent Lok and the like is not all it's cracked up to be if you ask me. Their are lots of factors that come into play with that stuff in order for it to work as advertised. Just my opinion of course, as lots of hunters swear by it and that's great, as long as they feel it works for them, who am I to say it doesn't.