> any form of nicotine consumption is very bad

With full knowledge that nicotine is is a poison; widely used in pesticides; that if you swallow one cigarette it'll make you sick, two and they will make you sick and kill all of your internal parasites, and swallowing three might kill you; and that nicotine addiction is harder to break than heroin addiction: is there any actual evidence that smoking nicotine (alone) is physically harmful?