The world is changing all the time and many countries/US states are decriminalising the use of marijuana/cannabis. (Personally, I welcome that).
But that is neither here nor there.
The question is how do you deal with a partner like this? You can choose to stay and keep the status quo, or you can leave. Up to you.
What is it that is keeping you tied to this man? Fear of being alone? That is no excuse. You have the power to decide what you want out of your life.
Personally, I smoke to relax in the evenings. It doesn't stop me taking responsibility for my life (I am a single mum). I work, travel, take care of DC, the house and extended family,and can organise anything that needs doing.
There's plenty of people, professionals even [gosh!] who function day to day while relaxing in their free time with a joint
I am NOT talking about the use of skunk!
I often see the use of cannabis in a relationship used as smoke and mirrors to hide other/different/deeper problems.
The bottom line in any relationship is "You do this, can I live with it"?
If not, move on and live your own life.