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.
On sugar yes. Some people have even died from having too much sugar. Name one person who died from over dosing on thc.
https://www.independent.co.uk/news/uk/home-news/baby-died-of-glucose-overdose-inquest-told-1812014.html
Lots of things can terrify you. Not all of them will kill you though.