Theres no safe number
Cigarette popularity also varies by region, with tastes differing based on age, lifestyle, and even local culture
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In fact, only by taking "dry puffs" on an e-cig -- which one vaping blog says "taste awful, can make you cough, and can also have the terrible side effect of leaving e-liquid in your mouth" -- would a vaper inhale more formaldehyde than a standard cigarette
Peer-reviewed research further documents that secondhand e-cigarette aerosol contains at least ten chemicals on California's Proposition 65 list of substances known to cause cancer, birth defects, or other reproductive harm including acetaldehyde, benzene, cadmium, formaldehyde, isoprene, lead, nickel, nicotine, N-Nitrosonornicotine, and toluene
