I just turned myself into an evangelist, to the point I'm considering reselling them. People look at me or make comments and I go into what sounds like a sales pitch explaining the whole thing.
"Oh, it's not a cigarette, there is no smoke thats just water vapor, maybe you heard the commercials on the radio. Check out how it works, this is the battery, this is the atomizer, this is the cartridge, the cartridge wicks juice into the atomizer and it heats it up, I'm exhaling steam basically. But it has nicotine in it so it solves my cravings and tastes great. I don't even want cigarettes anymore, I call them "analogs" hahaha, if you know anybody who smokes they should get one. Do you smoke? Want to try it?"
By the end of that they either want to be left alone or they want to know where to buy one, in either case, problem solved.