smoking

As a noun smoking

is tuxedo, dinner suit.

As an adjective antitobacco is

opposed to tobacco, often specifically to either the tobacco industry or public smoking.

As a noun smoking

is tuxedo, dinner suit.

As an adjective antismoking is

opposing or prohibiting smoking, particularly the smoking of tobacco.

As nouns the difference between smoking and varenicline

is that smoking is tuxedo, dinner suit while varenicline is a particular pharmaceutical drug, an agonist for nicotine, used to aid tobacco-smoking cessation.