The UK has just opened it's first hospital dedicated to treating Cannabis Psychosis. I do know cannabis psychosis is a real thing. Someone I knew was a heavey smoker, he was fine as long as he kept smoking, however, he took a break, after 2 weeks of NOT smoking, he started to feel euphoric, and really high, and was tripping out, within hours he was in full blown psychosis, running and laughing naked threw the streets, thinking god had told him to gather people, hallucinating, thinking he was super human, long story short, police found him, and took him straight to a mental hospital on hold, they didn't release him for 3 months.
My point is, although alot of people can smoke without problems. There are some people for which cannabis does trigger psychosis, depression, or other mental problems. Particularly the young who's brains are still developing. So there is truth to the fact that skunk can make some people crazy but not effect others. But I think there are lot of smokers who think cannabis is 100% safe for everyone, and won't admit that it has a dark side. The guy I was talking about was in his 40's when this happened, no previous mental problems, he had a great life, and it happened when he was withdrawing from cannabis. not while smoking it, I wonder what it was about abstaining that triggered it. Anyway, I am all for the freedom of responsible adults to be able to smoke legally, but I am also very aware that it has a dark side for some people.