Yes, HABITS is a Scrabble word!

Letter values in Scrabble US: H 4, A 1, B 3, I 1, T 1, S 1.

Is it a valid word?

HABITS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

an established custom
(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
the general form or mode of growth (especially of a plant or crystal)
attire that is typically worn by a horseback rider (especially a woman's attire)
excessive use of drugs

Also: riding habit, substance abuse, drug abuse.