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It's not just the nicotine, but also the tar and other compounds in cigars that contribute to this staining

So, I think that those [regulations] of the e-cigarettes and vaping companies is one that I think is a reasonable cost, because they do have a product that has the potential for harm. Gilbert said he believes e-cigarette companies used childhood nostalgia in their design to purposely target a vulnerable demographic

doi:10.18128/D070.V7.4 11

In the USA a much higher proportion of African Americans than European Americans smoke mentholated cigarettes

So we need research that can be presented in a way we can use for regular training of the people