When I was a kid my father regularly tried to persuade me not to start smoking. He went through hell himself when he quit smoking a pipe. He used to tell me the story of a guy he worked with who had quit smoking cigarettes. He carried his last half pack of cigs in his pocket for 10 years, used to take it out and show people whenever the topic of quitting cigs came up. One night they were in the pub after work, for no particular reason he pulled the pack out and lit one up. It was so old and dry that it burned all the way down in a few seconds and the one drag he took made him choke, but he immediately went to the bar and bought a pack. That was it, he was a smoker again. I guess the point of the story was that once you became a smoker you were always a smoker even if you quit for a while, like an alcoholic.
I've known a few non-smokers who tried vaping but as far as I know none of them became hooked and carried on vaping or moved on to cigs. They were all older though, maybe it could happen if you did that as a teenager.
