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Is mental illness caused by drug use?

So many young people have disturbing delutions these days, so many people regardless of age have mental illness these days. There's not enough funding and not enough research being done to figure out why the rates are so high?

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SW-User

To explain why mental illness happens to some people and not to others, the best example I can think of is the diathesis-stress model. This implies that everyone starts out with a certain genetic predisposition to mental illness (their diathesis). For some people that's very low, and for some people that predisposition is very strong, and they may even be more likely to develop a certain illness based on family history. Based on environmental influences like trauma or drug use, people become more and more stressed even if they don't feel it or can't tell, and some people have a lower tolerance for psychological stress which means they may eventually be more likely to develop some sort of problem. It's all very individual.

TL;DR it's complicated and I'm sure people are trying to figure it out, but there is no one-size-fits-all answer.

edit to add: greenmountaingal brings up another very good point and explains it better than I could :)