I mentioned on here before about an ethics professor I had back in grad school. He used to work for Phillip Morris (or maybe RJ Reynolds). He brought something like an ecig to class one day. I don't remember the brand name of it. I remember him saying this is what he had worked on in the
tobacco industry. He demonstrated it, and told us it emitted mostly vapor. He said it never went anywhere because of the enormous amounts of red tape the company would have had to go through to get it to market, prove it was reduced harm, etc... This would have been about 2001-2002.
It makes me wonder what other products tobacco companies have worked on and never been able to carry through. I know there were several cigarette type devices that heated tobacco rather than burning it, but they didn't fly with consumers. I think this product he was working on was different. Anyway, he left the company after that because his goal was to reduce harm from smoking and it was clear that there were too many barriers in the way.
I hope I am remembering that all correctly. It was quite a while ago.