Coming in here as a nurse and someone who tries to know what they are putting in their body-- like others said it's probably just poor regulation and putting all kinds of who-knows-what into those products because they are not regulated. Anything that goes into our bodies needs to have full disclosure of what's in it and be regularly tested to make sure those things are safe.
Remember the vitamin scares a year or so back? There were all kinds of things in the vitamins not listed on the ingredients, and a lot of them didn't even have what was supposed to be in them!
BTW I have never smoked anything . . lifelong asthmatic. I don't understand the appeal of smoking/vaping/etc. but I do enjoy my coffee, so I imagine it's something like that for smokers.
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