Keep in mind pure caffeine is very very bitter. I once tried caffeine infused water before, and it was quite nasty, so having a very high concentration of caffeine would definitely ruin the flavor. So since the bottle of E-Juice I tried didn’t have any bitter notes, I’d say a low concentration was used.

In fact, the bulk of the evidence suggests that the introduction of the cigarette filter, while obviously not making cigarettes substantially safer, did result in small but measurable declines in cancer risk. These declines occurred due to a tremendous reduction in tar yield, from levels as high as 40-50 mg down to less than 20 mg. The evidence suggests that further declines - to levels below this massive initial drop - were not associated with further declines in cancer risk.

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