Yes, ADDICTIONS is a Scrabble word!

Letter values in Scrabble US: A 1, D 2, D 2, I 1, C 3, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming (especially alcohol or narcotic drugs)
an abnormally strong craving
(Roman law) a formal award by a magistrate of a thing or person to another person (as the award of a debtor to his creditor); a surrender to a master