I've thought about this a lot recently. I've actually really, really been thinking about quitting myself and I've been thinking about building a site about it once I've done it.
The thing with the non-smoking offers is what smoker in there right mind is going to order some gay ass ear magnet to quit with?
If I go through with it, I'm probably going to do sort of a "review" type of site presenting them with different options.
I also think that building up a community over time would be better in the long run then sending them to a landing page, at least in this niche.
Because you'll get people that want to try the patch, it doesn't work, then the gum, it doesn't work, then they'll order "Easy Way To Quit Smoking" because it's helped so many people, they'll read it, not quit, go back to the site for more suggestions, ect.
The ones that do quit will stick around to support the newbies. You'll get a lot of threads saying "I Quit With Method X" ect, and it'll encourage others in the community to try that method.
As for offers I haven't looked that deep yet, but my thinking from the start was that promoting quit smoking products via PPC strait to landing page is probably going to convert like ass, unless you can find some good survey offers or offers where they aren't spending a ton of money ordering some product that no one has ever heard of.
Just my .02.