One episode of psychosis is not a life long psychotic illness.<p>When people say &quot;psychedelics cause mental illness&quot; that could mean:<p>* Someone with no underlying mental illness takes a few doses of LSD and is left with a life long psychotic illness<p>* Someone with no underlying mental illness regularly takes huge doses of LSD, and ends up with a life long psychotic illness<p>* Someone with underlying mental illness has that illness surfaced by LSD use, when it would have gone un-known if they hadn&#x27;t taken psychedelics<p>* Someone with underlying mental illness has that illness surfaced by LSD.  But it probably would have happened anyway.<p>* Someone with mental illness has that illness temporarily triggered by LSD.<p>Because LSD is illegal and it&#x27;s very hard to research we don&#x27;t know much about the interactions of LSD and mental illness.<p>While I&#x27;m strongly pro-legalisation I do find it problematic when people dismiss any possible harms of drug use, when it&#x27;s fine to say we don&#x27;t know, but should legalise anyway.