Doing positive things is alway a wise move....just take it easy on yourself..
I had quit drinking and gave up smoking; cold turkey...so tough!
In hindsight, I would have taken it a little easier, focused on one bad habit at a time.
While I did stay a non-smoker I did go back to drinking...unfortunately.
The drinking lasted for about 18 months on and of, now I am back on track and I am happily a non-drinker and a non-smoker : )