knock the habit

knock the/(one's) habit

To give up something to which one is addicted, especially drugs. Different people have different methods of knocking the habit. For me, the only way I could quit smoking was by going cold turkey. You're going to need a lot of support from family and friends if you're going to knock your habit. Withdrawal is no joke. I've really been trying to kick my habit of compulsive shopping lately, but it's a lot harder than I thought it would be.
See also: habit, knock
Farlex Dictionary of Idioms.

knock the habit

to stop using drugs; to break a drug addiction. I just can't knock the habit. He tried to knock the habit by drinking lots of booze.
See also: habit, knock
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

knock the habit

tv. to stop using drugs; to break a drug addiction. (see also kick the habit.) I just can’t knock the habit.
See also: habit, knock
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • knock the/(one's) habit
  • go in a different direction
  • left, right and centre
  • left, right, and center
  • left, right, and centre
  • break a law
  • break a/the law
  • chalk
  • (as) different as chalk and cheese
  • as different as chalk and cheese
References in periodicals archive
GIVE up the heartache you'll be storing from smoking and go into spring tobacco-free with these reasons to knock the habit on the head: | Quitting a 10-a-day habit, you could save more than PS1,000 a year - rather than smoking away your dream holiday or that new kitchen, why not make it happen?
And let's knock the habit of lying and cheating once and for all.
This EU suggestion is aimed at reducing the environmental impact of heating the great outdoors, but may be yet another incentive to smokers to finally knock the habit on the head.
It's time to knock the habit of evergreen turf, he maintains.