Yes, they address this: > Although correlational in nature, results suggest that lifetime experience with psychedelics in particular may indeed contribute to p

Yes, they address this: > Although correlational in nature, results suggest that lifetime experience with psychedelics in particular may indeed contribute to people’s pro-environmental behavior by changing their self-construal in terms of an incorporation of the natural world, regardless of core personality traits or general propensity to consume mind-altering substances. and > Rather than psychedelics promoting nature relatedness, for example, it could be that people who feel more connected to nature are more likely to consume psychedelic drugs. But the researchers do not beleive that this is the case. > “As the relationship we found remained significant after controlling for demographic variables and personality traits such as openness to experience, conscientiousness, or political attitudes, it is unlikely that the association we found can be entirely explained by a collection of personality traits stereotypically associated with psychedelic users (e.g. being of the ‘hippie’ type).” from this interview with them: http://www.psypost.org/2017/09/study-suggests-psychedelics-promote-eco-friendly-behaviors-altering-relationship-nature-49592 http://www.psypost.org/2017/09/study-suggests-psychedelics-p... Also note that the paper/title say 'predicts' not causes, which is accurate, it's a correlation and X being true does predict Y being true, but we don't know if X causes Y, even if the authors suspect that it might.