substance abuse vs habit

substance abuse and habit both are nouns.

Word	Noun	Adjective	Verb	Adverb
substance abuse	Yes	No	No	No
habit	Yes	No	Yes	No

As nouns, substance abuse and habit are synonyms defined as:

Other synonyms of substance abuse include drug abuse.

substance abuse (noun)	habit (noun)
excessive use of drugs	excessive use of drugs
	(psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition
	a distinctive attire worn by a member of a religious order
	attire that is typically worn by a horseback rider (especially a woman's attire)
	an established custom
	the general form or mode of growth (especially of a plant or crystal)

substance abuse (verb)	habit (verb)
	put a habit on