My mistake. I meant physiological harm. Will edit. Edit: cannot edit any longer. While I do not think they do cause psychological harm in the long term (I thi

My mistake. I meant physiological harm. Will edit. Edit: cannot edit any longer. While I do not think they do cause psychological harm in the long term (I think they force confrontation with buried psychological issues in order to transcend them), they most certainly can cause short term psychological distress and issues for people unprepared, approaching with the wrong mindset, or using in an otherwise problematic set or setting.