THC levels in cannabis have soared in recent years, raising the risk of psychosis—especially in young, frequent users. Studies reveal a strong connection between cannabis-induced psychosis and schizophrenia, making early cessation and treatment essential.
Too much of any mind-altering substance will cause mental debilitation at some point. Moderation in all things. I say this as someone who has gone hard on a few different drugs (including alcohol) throughout my life.