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The difference comes down to how your body processes the hormone

Cancer: At least 70 of tar's 7,000+ chemicals are proven carcinogens, including benzene, arsenic, and formaldehyde, increasing the risk of lung, throat, bladder, and esophageal cancers

The latter of which houses the e-liquid

There is no safe threshold

The amount of nicotine in cigarettes can vary depending on the brand and type, but a typical cigarette contains around 12mg of nicotine

[21] In addition, they noted a significant correlation between flow-mediated brachial artery endothelium-dependent vasodilation and NO bioavailability from cultured HUVECs exposed to serum from the same individuals