Most e-cigarette analyses indicate cancer potencies <1% that of tobacco smoke and <10% that of a heat-not-burn prototype, although a minority of analyses indicate higher potencies.
Optimal combinations of device settings, liquid formulation and vaping behaviour normally result in e-cigarette emissions with much less carcinogenic potency than tobacco smoke.
Citation: Stephens WE Comparing the cancer potencies of emissions from vapourised (vaporised) nicotine products including e-cigarettes with those of tobacco smoke Tobacco Control 2018;27:10-17.
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