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This is what I'd expect for tobacco, but it tells me little about nicotine. Most of the subjective effects are not from tobacco, so It's still plausible that nicotine does not develop tolerance. Indeed, the effects that don't go away are the effects expected from nicotine.

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For a blog post commenting on an earlier draft of this article (many points raised remain relevant) see here.

That part never worked. But maybe these annotations will? That’d be neat.