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Morelli, Caffeine and the dopaminergic system, Behav Pharmacol 16 (2005) 6377

On the other hand, more people are day in, day out becoming more inclined to smoke e-cigarettes, which may lack that old-school touch but are much "healthier." In the US, where you can compete in just about anything, a new sports discipline has been brought into existence: puffing out the largest possible cloud of e-cigarette smoke

US Food and Drug Administration

Getting tubes on difficult

So rather than having a separate tank that screws off and houses the coil, you simply screw the coil into the top of the battery and the glass tank section is then fitted over the top