Answer:

using

AnswerCrossword Clue
USINGOn drugs
USINGNot abstaining
USINGTaking habitually
USINGTaking drugs regularly
USINGIncorporating
USINGMaking the most of
USINGWith the help of
USINGNot abstinent
USINGPutting to work
USINGManipulating
USINGBringing into play
USINGTaking advantage of
USINGHandling
USINGVia