Yes but it's currently estimated you'd have to prevent 40'000 people from ever trying marijuana to prevent a single case of schizophrenia from being potentiated - a case of schizophrenia which may have eventuated regardless in the at risk individual.
If you contrast this to the risk and injury rates of an activity that is perceived as wholesome such as horse riding...
There is adequate amount of scientific evidence which indicates that marijuana may help prevent alzheimer's, lung/brain/breast cancers, parkinsons disease etc...
If you contrast this to the risk and injury rates of an activity that is perceived as wholesome such as horse riding...

There is adequate amount of scientific evidence which indicates that marijuana may help prevent alzheimer's, lung/brain/breast cancers, parkinsons disease etc...