I have several friends who have been mental health nurses. They all attest to the dangers of cannabis directly linked to psychosis and schizophrenia. It is not harmless.
I never said it was harmless or benign just less impactful than other substances. Self-diagnosing is really dangerous and
self-prescribing is really dangerous in the arena of serious health issues.
And 100% agreed, when there is a history of psychosis it can be detrimental. My family is full of medical practitioners (including a Dr. that specifically deals with substance abuse treatment) and the prevailing perspective ('round here) is that cannabis as a rule is safer than methodone et al for treating withdrawal fallout.
BUT if there is no family history of mental illness and no individual history of mental illness Cannabis can be a safe alternative. I mean Cannabis is demonstrably less harmfull than tobacco (as a rule) when not taken in through the lungs.
The strength these days has been intensified and those exploring the waters need guidance as with any substance (alcohol, how much is too much? supplements, how much is too much? etc).
Nothing is always safe - dairy allergy just killed a kid eating a chicken sandwich. People are dropping left and right here in the states from tobacco vape products. People are presenting with heart problems from drinking energy drinks. Schools don't allow any nuts in kids or teacher snacks/lunches. Nothing is harmless or benign I mean you can drink too much water and cause brain swelling and ultimately death.
I look at these things from a pragmatic perspective. Legalizing marijuana mitigates black market sales that could contain unregulated contaminates by law-enforced testing and oversight.
And for me, my ancestry, it is a spiritual accoutrement to meditation and gathering of individuals for conflict resolution. Personally marijuana saved me from living on a steady supply of narcotics for chronic jaw pain (post surgical), endometriosis, and ADHD (Adderall no more!)... no other substance allows me to be a well and productive individual without moving through my days feeling sick or experiencing debilitating pain. I don't have to wear a mask of comfort to navigate the world as a small dose lessens (doesn't remove) the impact of my physical discomforts so I actually feel comfortable and less vulnerable as well as more alert as I can compartmentalize the pain in a way impossible when dependant on narcotics.