A lot of the ‘super strong’ weed that got a reputation for ‘inducing psychosis’ is due to a couple of strains that have been bred to have a very high THC content and unfortunately a high CBN content.
These strains came to prevalence post 2003/4 after the ports closed up with the ‘war on terror’ ramping up with the invasion of Iraq and the increase in large scale industrial growing in the uk. The reason being a lot of growers couldnt grow good weed, but grow a strain with a massive thc level and you can still sell it as its ‘strong’. The unfortunate side effect of this is the unwanted CBN’s. The most prevalent of these is / was ‘Cheese’, which actually was a multitude of hybrids of a particular strain.
This also tends to be the strain grown by criminal gangs due to its rapid flowering cycle and high production density means you can produce lots strong weed without the ability to grow properly.
I smoked daily for a decade but for the most part avoided these strains. I found the highs were never as nice and tended to be a much more hectic high.
Incidentally I still managed to gain a Masters Degree and work at a reasonably high level in my industry during that time. However I will admit I have a bit more motivation to do other stuff since quitting regular consumption.
Like anything I think the key is moderation.. Yes there are horror stories about X person got high and then did Y or Z. Im sure there are a multitude of people who got drunk for the first time and had an adverse reaction / killed themselves / killed another person / took the first step to alcoholism etc etc however due to alcohols accepted nature you just don’t hear about them in the same way.