"Coffin nail" & "cancer stick" are dysphemisms, not euphemisms. The first is more than 100 years old.

Some time ago I read a magazine article by an old man who had been an actual 19th-century cowboy. He said it made him hoot to see cigarette advertisements featuring cowboys. In his day, cowboys wouldn't have been caught dead smoking cigarettes, which they thought effeminate and referred to as pimp sticks. He explained: Cigarettes were introduced as an attempt to make a ladylike cigar that women would smoke. But in those days no respectable woman smoked, so the people who took them up first were the whores. The pimps followed their example & thus were the first male cigarette smokers.