this is a survey with multiple studies, and they seem to all say one of three things:

1) some of them couldn't find a signal
2) most of them reported increased levels of cortisol in non-habitual users
3) some of them reported decreased levels of cortisol in daily users

so, the idea that marijuana reduces stress reduces to the idea that an addiction to marijuana completely dismantles your body's ability to cope with stress altogether, meaning you'd be unable to experience stress when you actually had to. the long term result of such a thing would have to be negative...

i mean, your body doesn't produce stress hormones by accident. they're there for a reason, and it can't be healthy to get rid of them.

and, i'm actually going to state that it appears to be a robust and accepted conclusion in the literature that it increases anxiety in moderate to casual users.

i guess i could just sit here and let this guy destroy my endocrine system to the point that i'm incapable of experiencing stress, but i hardly want to do that.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6174415/