If you take one thing away from this thread,
take away this.
Someone looking to reduce the harm of/quit smoking doesn't just need e-cigs.
Someone looking to quit smoking/reduce the harm of smoking is starting to be more health conscious too... So maybe they'd like to know the benefits of juicing (or the hundreds of other health products out there)... Also, lots of people who quit smoking start piling on weight... Do they want to lose weight? What about keep weight off while they're giving up smoking, are their supplements they can take to help with that?
You're a moron if you're just selling someone an e-cig and letting them get on with their life. There's an unlimited amount of stuff you can sell to these people.
Get their emails. Send them tips to stop smoking, and make sure that the tips throw in random other products every now and then too
. "How to avoid weight gain when quitting smoking", "Supplements that help to reduce cigarette cravings", "Supplements that help to reverse the damage of years of smoking".. (No idea which of these things exist, but you get the idea!)