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More importantly, studies show that vaping causes oxidative stress, DNA damage, and cellular changes that are known precursors to cancer.2 Laboratory studies repeatedly demonstrate that e-cigarette exposure damages DNA, promotes tumor growth, and triggers cellular changes that often lead to cancer over time

By the 1970s, some brands of light cigarettes contained more tar and nicotine than full-flavor cigarettes (whose own tar and nicotine levels had been decreasing)

J Cannabis Res 8 , 13 (2026)

Everybody knows that a certain amount of liquid nicotine, when drunk, can be dangerous, and the lower limit causing fatal outcomes is 6.5 13 mg/l when drunk

Cigarette smoke-induced epithelial expression of WNT-5B: implications for COPD