The truth is there marginally healthier than conventional smoke, relatively odorless and the difference in taste is subjective.
I don't smoke tobacco but I know a lot of people who used them to try to quit only to have them replace conventional cigarettes so they're probably at least as addictive if not more because I think most of them actually have more nicotine per puff.
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Not marginally. They still have a ton of stuff in them. Not good
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Marginally healthier as in just barely not as bad for you as conventional smoke but still not "healthy" in any sense of the word.
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Marginally? That margin is around 95% safer than smoking. No potassium nitrate, no carbon monoxide, no cyanide, no arsenic, no formaldehyde (unless you burn the oil way passed intended temperatures that causes dry hits.
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You are correct, the concentration of nicotine is higher.