If you know my work, you know I am a fan of LSD. Medical studies have advanced, globally, and have unveiled some interesting physiological effects induced by the drug. Both at Harvard and TheRoyal College of London, breakthroughs have indicated a serious value in the drug, including an ability to help you quit smoking.
It is found to light up large segments of the brain concurrently and produce synaptic pathways that would not, otherwise, be there.
Interestingly, creating the pathways can allow a person to recreate them later, whence LSD is used to help carve new behaviors and break addiction.
Though there isn’t much public knowledge about Robin Williams’ use of LSD, he seems to have the experience down.