> In all the studies included in our review, we identified 11 deaths presumed to be completed suicides that can be fairly confidently linked to classic psychedelic use in a non-clinical context (four jumping from a height [of which one of these individuals was also intoxicated on alcohol], one walking into traffic [unclear intent], one drowning [alone on the beach with unclear intent], two self-stabbing with a sharp object or knife, and three with unclear methods). This supports the notion that noncontrolled environments where individuals are by themselves and have access to means for suicide, such as heights with no barriers and objects that can lead to hanging or self-stabbing, are likely unsafe contexts for psychedelic use, especially among individuals presenting with prior suicide risk. There is much evidence suggesting that restricting access to lethal means is a key method for suicide prevention in general, and it stands to reason that for those using psychedelic substances in non-clinical settings, the pre-emptive restriction of lethal means could help reduce the risk of suicide.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8033757/