The kid had mental problems and killed himself. Weed didn't do that to him.
Did you not read the link, pointing research showing that marijuana causes a
fivefold increase in mental health problems?
And scientists caution that a direct link has not been found. Did the marijuana use increase the likelihood of the mental illness or did the mental illness lead to the marijuana use.
Nice try, but schizophrenia does not cause a person to smoke marijuana. You're coming dangerously close to spreading the same tired negative stigmas about mental health disorders that people with mental health disorders are
crazy, and just do
crazy things. While
mood disorders can sometimes lead to people self medicating with booze and other drugs in hopes of alleviating symptoms, psychotic disorders are not going to cause someone to do drugs because an imaginary elf on their shoulder made them do it.
The research demonstrated a dose dependent increase in risk of psychotic disorders. Daily use of low grade stuff causes a three times increase in risk, while the high potency stuff causes a five times risk. The dose dependency link additionally demonstrates that the illness cannot be a cause of the drug use, as the imaginary elf on the shoulder is not going to make a point to require the afflicted patient to test the marijuana for potency and only consume marijuana of a certain THC level. If the the illness was causing these people to use marijuana as a self medication technique then we should expect to find no such differentiation; instead we should see consumption volumes fluctuating to adjust for potency in order to render comparable total amounts of THC. Furthermore, the fact that these were "first episode" cases makes it effectively impossible to maintain your suggestion that the psychosis preceded and led to the marijuana use.
As the paper states "Cross-sectional and prospective epidemiological studies, as well as biological evidence support a causal link between cannabis use and psychotic disorder."