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Like SLT, areca nut has been classified as a Group 1 human carcinogen (IARC, 2004).[] The major constituents of areca nut are carbohydrates, fats, proteins, crude fiber, polyphenols, alkaloids such as arecoline, arecaidine, guvacine, guvacoline,[] and minerals.[] Presence of sodium, magnesium, chlorine, calcium, vanadium, manganese, bromine, and copper has been reported in areca nut, pan masala, and other areca nut-containing chewing products.[] Arecoline, the major alkaloid in areca nut, has been found to stimulate collagen synthesis in fibroblasts;[] whereas, catechin, flavonoid, and tannin compounds in areca nut cross-linked collagen fibers making them less susceptible to collagenase degradation.[] It has also been suggested that copper upregulates lysyl oxidase, leading to excessive cross-linking and accumulation of collagen in patients with oral submucous fibrosis (OSF).[] In a study of seven Indian SLT products, high level of copper were detected in four gutka products as compared to zarda , creamy snuff, and khaini , which do not contain areca nut.[] Jacob et al .,[] demonstrated a definitive dose-dependent relationship between the frequency and duration of chewing areca nut without tobacco and the development of OSF in users

For example, Kansas City, MO and Kansas City, KS both passed legislation that included e-cigarettes in their clean air ordinances at the same time as they passed Tobacco 21

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Thorndike, MD, MPH, suggested a third scenario as being more likely for young users: Teenagers who vape may never switch to smoking but will become nicotine-dependent adults who vape. With novel vaping technologies that deliver high doses of nicotine efficiently and cleanly, the gateway theory may be outdated, wrote Thorndike, with Massachusetts General Hospital and Harvard Medical School in Boston

Bird smoking, illustration, vector on a white background

Understanding the chemical impact helps in making better health decisions