I'm not sure, but I think with cigarettes, a major proportion of the really bad chemicals are actually in the cigarette paper.
You can see this when u lite one up, and just watch the paper burn and u can see little flare ups and sizzles, which are definitely coming from the paper. They do it to try to make the cig burn evenly.
I can't smoke cigs, they make me cough and splutter and choke, even tho' I'm a heavy 'smoker'. Take away the paper and I'm fine! Go figure.
…. but that was a most informative read, wot u wrote Lee. I had a vaporiser, which made things much smoother, but it got 'lost'.
Give up D2, while u can soon, otherwise u never will. The job will definitely help u cut down, as we all know, it's mainly when u have idle hands, that u unconsciously reach for a cigarette.