[yorwba]

The walls are but an inconvenience for the determined: http://journals.sagepub.com.sci-hub.cc/doi/pdf/10.1177/02698...

I'm not qualified to evaluate the paper, but here is their summary.

Summary. We found a linear relationship between lifetime experience with classic psychedelic substances and scores on two sub-dimensions of nature relatedness, NR-Self and NR-Experience. The more people had experience with classic psychedelics, the more they enjoyed spending time in nature, and the more they construed their self as being a part of nature. None of the other substance classes included in our model significantly predicted any of the nature relatedness dimensions individually.

NR-Self, in turn, was the only dimension of nature relatedness that positively predicted self-reported engagement in pro-environmental behavior, and significantly mediated the relation between experience with classic psychedelics and pro-environmental behavior. That is, the perception of being part of the natural world — rather than being separate from it — that is heightened for people who have experience with classic psychedelics, is largely responsible for the increased pro-environmental behavior that these people report. Notably though, as the direct effect of experience with psychedelics on pro-environmental behavior remains marginally significant after controlling for the indirect effect, it is likely that it is not entirely driven by the mediating variable we identified. Which other factors may contribute to this effect, however, is for future research to determine.