Both high- and low-frequency marijuana usage were associated with a significantly increased risk of schizophrenia. The frequency of use among high- and low-frequency users is similar in both, demonstrating statistically significant increased risk in developing schizophrenia.
Links
[1] https://pubmed.ncbi.nlm.nih.gov/35018649/
[2] http://www.rethinkpot.org/tags/mental-health
[3] http://www.rethinkpot.org/tags/schizophrenia
[4] http://www.rethinkpot.org/tags/youth