Afaik: some may have physical side effects as well as severe mental complications.
Low-grade pot is safer and can be quit anytime.
Find out if there are any support groups.
It might be easier to share genuine feelings and accept feedback from people without emotional walls built up (i.e. spouse).
Spend time with them, talk and listen, and do what you can.
Doing your best in a situation leaves no regrets behind.