can smoking cigarettes cause a heart attack and Your - How Smoking Affects the Heart and Blood Vessels How Nicotine and Tobacco Affect

Nicotine is harmful to developing brains and its use during adolescence can disrupt the formation of brain circuits that control attention, learning, and susceptibility to addiction

"Risks and Benefits of Commonly Used Herbal Medicines in Mexico." Toxicology and Applied Pharmacology , 227(1):125-135, 2008

Immunologic self-tolerance maintained by activated T cells expressing IL-2 receptor alpha-chains (CD25)

So, even if you do gain weight after quitting, your body is still doing something incredible

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Cotinine is the ideal biomarker for tobacco exposure because its only present after the body has processed nicotine and boasts a significantly longer half-life of 15 to 20 hours