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New Zealand scraps world-first smoking ‘generation ban’ to fund tax cuts
(www.theguardian.com)
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It's not just nicotine though. Effects of MAO inhibition and a combination of minor alkaloids, β-carbolines, and acetaldehyde on nicotine self-administration...
We don't know the full role Tobacco specific Nitrosamines and other alkaloids play, but it's there.
It reinforces the effect of the nicotine. That's literally why tobacco companies were adding acetone to cigarettes back when they were publicly denying it was even addictive.