Some e-cigarettes have a cigarette-like LED tip that glows red (or another color, depending on the product you're using)
When the coil heats up without enough e-liquid to vaporise, it burns the wick, usually made of cotton, causing that unpleasant burnt taste
These cancer potencies are derived from the respective levels of carcinogen emissions, obtained through analytical chemistry, and their associated inhalation unit risks (i.e., the excess lifetime cancer risk from continuous inhalation exposure to a normalized concentration of the carcinogen)
The prevalence of the comparative harm perception of ENDS dropped by nearly half by Wave 5 (% (95% CI): 27.6 (26.3, 28.9)) compared to the baseline (Wave 2: % (95% CI): 42.2 (40.7, 43.7)
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