Colorado:
Marijuana is the most common drug found in the toxicology of teenagers who have committed suicide. Between 2014 and 2018, the proportion of suicides under the influence of marijuana has increased from 14 to 23%.
Of teenagers aged 15-19 who committed suicide in 2018, 37% tested positive for marijuana (of the two thirds whose toxicology information was available). The trend appears to be exacerbated by the growing potency of the drug, which causes irreversible damage to teenagers’ health.
https://rtd.rt.com/stories/effects-of-marijuana-legalisation/
“Between 2014 and 2018, the proportion of suicides under the influence of marijuana has increased from 14 to 23%.”
It also increased in nonlegalizing states; “Liberalized marijuana policies do not appear to have influenced increases in marijuana-positive toxicologies among youth” - https://psycnet.apa.org/record/2019-23139-053