Prescription drugs are tested in a controlled enviornment before they are available for purchase, try again.
OK, then. I guess I have NEVER seen some medicine taken off the shelves 10, 15, 20 years after they were first made available.I must have imagined it, because, of course, Pharma makes it's own long-term studies for 20 years before it releases anything in the market. Therefore, everything Pharma creates is perfectly safe - even Chantix.

Tests in a controlled environment do not equal long-term studies. At all. The only way you can make a reliable, long-term study is to let the product be available for a broad population and see what the effects are, well... long-term.
So, not even medicines are studied long-term before market release.
Have food colorings and preservatives been tested long-term, before being released into the market? No. Did people stop eating, or worry about them? Hardly.
Have cell phone or wi-fi radiations been studied long term? Can we be 100% safe that those are not going to hurt us, even in a remotely possible, hipothetical way? No. Do we use cell phones and wi-fi? Yes. Are there regulations being passed - regulations that would kill cell phones and wi-fi as we know it - to "protect" us poor citizens? No.
Therefore, the e-cig is the ONLY comsumer product that needs proper long-term studies before we have the freedom to use it - how exactly are those long-term studies going to be done, if people cannot use it at all? Oh wait. "Gobbermint" is NOT really interested in making those studies, so all is good for them and their buddies who are losing boatloads of money. By killing the e-cig industry with draconian, uncalled for regulations, they will always be able to tell "we have no long-term studies [because we took that revolutionary, incovenient product from the hands of the people]"