In general, I've had much more success at substituting good things than cutting out bad things. I tried and failed to stop drinking soda many times, but eventually succeeded without much difficulty after I'd installed the habit of drinking seltzer water.
This is the public group instrumental rationality diary for December 16-31.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating.
Immediate past diary: December 1-15
Rationality diaries archive