Speaking from an addicts perspective. Not many ppl consider pot to be a drug to be addicted too. but i am proof of that. I had been smoking for better then 20 years. my ex wife meet me when i was into it pretty heavy. being high everyday all day.
After 5 years (2 of which we were married) I quit. And found that i was no longer attracted to her. One and half years of hell and fighting we finally gave up. Me being strait also pushed her away because I would not let her get away with nothing anymore. unlike before when she did what she wanted, when she wanted. I have now been strait for almost two years( two in June ). And understand what I was missing out on. LIFE.
Only the addict can make the choice to change or quit. You can help with understanding, but any more then that will just drive the person back.

Thats my look on it. What would i do? Understand that quiting is like letting a part of yourself go. The the person waiting to be found is so much Better.

Grammar and spelling sucks so be it.