The amount of carcinogens contained in electronic cigarettes is much less than that of traditional cigarettes. However, nicotine, formaldehyde, acetaldehyde and other substances in e-cigarette liquid still have cancer risk.
E-cigarette oil contains ingredients other than nicotine, such as propylene glycol, vegetable glycerin, natural flavors and other organic compounds, as well as some unknown gaseous organic compounds. These substances will decompose when heated to produce some toxic substances, such as formaldehyde, acetaldehyde, benzene, etc., which are considered carcinogens.
In addition, although nicotine in e-cigarette liquid itself is not carcinogenic, it can promote the combination of polycyclic aromatic hydrocarbons (such as benzopyrene, dimethylbenzo[a]pyrene, etc.) with DNA, resulting in cancer.
It should be noted that e-cigarettes are not harmless, and their use still has health risks. Therefore, it should be used with caution and in accordance with relevant recommendations and laws and regulations.