Welcome to SR, I'm glad you found us and joined in.
I'm sorry about his addiction. Marijuana is too often excused by people as being the least of addictions, when in fact it can steal the soul of the addict just the same as any other drug, and it has ruined many marriages and families along the way.
I bailed my son out of jail once only. He made promises of how he would change and cried about what a lesson he had learned and how awful it was in there...blah blah blah...because he wasn't out an hour and he was using again. I never did it again, and the world didn't end when my son was in jail.
Make yourself comfortable and take a read around. You will find many who have been where you are and who will share what worked for them.
We can't save our addicted loved ones, but we can let change begin with us and how we handle our side of the street.
Hugs