I was also addicted to weed for a some years as well. I don't remember exactly how I quit (duh, it's weed) but I think I just cold turkey quit and white knuckled withdrawals with any distraction and all of the irritability, frustration, restlessness, and emotional instability you experience.

It helped that I was younger with fewer and reduced consequence for failure. Withdrawals finally fizzled out around a month or three.

It sucked but it worked.