All excellent points, but I wonder if the whole hand-to-mouth/ritual/oral-fixation/"smoke"-in-the-lungs-and-in-the-air factor makes e-cigs much more effective for most smokers, despite their apparent inefficiency as a nicotine delivery mechanism.
I found it interesting that in the NZ study, 0 mg liquid and 16 mg liquid apparently were
identically effective at reducing nicotine cravings for the first ten minutes after vaping. The very placebo act of going through the motions appears to have helped alleviate cravings when no actual nicotine had been ingested (although, as expected, as time goes on, the relief from the 0 mg liquid disappeared faster).
There are a lot of vapers here who seem to have been able to give up analogs practically from Day 1, and lots who have weaned themselves down to zero-nic liquid and keep on vaping; I would say that the physical addiction to nicotine was a relatively minor part of their overall smoking addiction. And then there are people like yourself who simply can't physically get all their nicotine from vaping and need to supplement with other delivery methods, and so I'd surmise that the nicotine addiction is at the forefront for you. I mean, obviously smoking is a very complex addiction with many components, and everyone has different physiological and psychological needs.
I still bet that if subjected to similar methodologies as in existing
NRT studies, e-cigs would prove to be far more effective than gums, patches, inhalers, etc. already on the market. But you're certainly right that the
FDA will only look at the nic levels. After all, it was the assumption that it's "all about the nicotine" that brought us such woefully unsuccessful treatments as the gums/patches/inhalers in the first place.
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