I kinda quit a lot at once. 4 months ago i quit: living on my own, smoking cigs, smoking pot, doing drugs(choose not to say which), breaking the law, hanging out with my druggie friends, and eating carbs.

Replaced the old habits with running, hanging with family and talking, going to the gym, and military training

gotta say that quitting all at once was the most stressful, depressing, horribly, awful, worst thing ever!!!.....BUT it did get better, i AM happier now than ever before, and it was SOOO worth it.

So glad to have quit smoking(and others), breathing is so nice now lol