My son has quickly developed a horrific cough since he began vaping, which he does almost nonstop all day.
The devices & products were originally marketed to gullible folks as non-addictive, thus safer than, and a way to quit, cigarettes.
Users are sucking in nicotine and the droplets from weirdly perfumed oils, plus microscopic hard minerals & acids off the batteries that power the devices.
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The cheap, synthetic nicotine that’s sold in minimarts and preferred by our government (no surprise) does that almost immediately. I consider them very dangerous. Sadly, most teens don’t have the money for the good ones that can only be sold by licensed smoke shops. I’ve been vaping 2 years now and never cough. I bought a cheap one once before I knew, developed a horrible cough and developed a gravely voice. I pitched it and the problems resolved.