Having started vaping 6 months ago, upgrading to new devices and going completely off cigarettes, I've been encouraging my friends to start, even buying them starter kits and liquid. However, one of them in particular must have sucked in too hard and got some in his throat. He later got a bad sore throat. His experience is only compounded by another friend telling him he got ammonia after vaping. The good news is he occasionally uses the Blu cartomizer styles where he can't smoke, but I don't think those puny things will get him off smoking. I'm concerned that this kind of thing is how the anti-GMO and anti-vaccine movements got started. I'm not sure what the answer is.