B People have smoked tobacco for centuries, and the harmful effects of tobacco smoke have been s...

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smoke smoked smoking to smoke

not; be smoking not; have smoked not; to smoke be not; smoking

ever smoked have ever smoked had ever smoked was ever smoking

had smoked smokes have smoked smoked

You shouldn’t have smoked so much You will make a good husband How did you keep smoking for so long? Why couldn’t you stop it?

people smoking being smoked to smoking people being smoked

smoke; to smoke smoked; to smoke smoked; smoking have smoked; smoke

ever smoked have ever smoked had ever smoked was ever smoking

not； be smoking not； have smoked not； to smoke be not； smoking

smoked have smoked has smoked don’t smoke

can’t have; smoked may have; smoked should have; has smoked should have; didn’t smoke

have begun to smoke smoked began to not smoke had smoked

can’t have; smoked may have; smoked should have; has smoked should have; didn’t smoke

smoking to smoke smokes smoked

had smoked smokes have smoked smoked

smoked have smoked didn’t smoke haven’t smoked

didn’t smoke have smoked smoked began to smoke

smoke smoking to smoke smoked

to smoke, need smoking, have to smoke, must smoked, may