My fiancé, aka Crazyman is on medical Marijuana Pgm -- and likes it, imho, a lil too much. He's always been a toker -- way back when we first knew each other at Univ, I just thought "OFW...." but that was decades ago, & to my ken the only periods of abstinence he had were when he worked for a very very hoity-toity company and his boss announced that random drug screens would now commence. Yeow -- he stopped cold for awhile -- and his ex moved out bc he was impossible to live with!
But. It works better for his PTSD, severe anxiety, Panic Disorder, and various other glitches, than any of the gazillion meds that had been tried over the years. He has atypical reactions to lots of things (ex: Xanax makes him manic and behave very bizarrely and self-destructively )

The issue I have is, I believe, similar to what I think you're saying: Like any other medicinal substance, it's possible to abuse/over-use it. And how we decide where that line is, imho, is that it's adversely affecting the ability to get on with Real Life.
In which case, it becomes necessary to Bottom-Line w/the other party involved. Who is supporting the cost of your wife's MJ? You, right? Since she's not working?

That's what it boils down to for most of us. Me: 'Dear Fiance, if you have a thousand-plus dollars to throw on your (Legal, jsyk) expensive preferred-strain of weed, not once but TWICE this month -- then how about some consideration towards help w/paying the electric bill??!"

Am one of the least confrontive people ever BUT cmon now!
That fight lasted 3 days.

I reckon you'll have to decide what's the goal for you -- and what you're NOT willing to put up with.

Good luck, friend.

Chyia :/