yeah, uhm, don't do weed?
Honestly, learn to have fun without doing weed. There are lots of things you can do, so pay attention to them instead of weed. You don't need motivation to give up weed. If you wanna quit for at least a while, just keep your mind on other things besides weed.
Hmm, I just noticed all my sentences ended with the word weed
Also, I quit smoking and went through package after package of toothpicks, if only to have something in my mouth, maybe you can find a similar substitute for weed?
Hope any of this helps...weed!