That is a very severe understatement. He was so badly addicted to benzos (for years) that he ended up going to Russia to have himself put into a weeks-long medically-induced coma to go cold-turkey, which resulted in brain damage. (He insisted on that course of action, which Western doctors refused to go along with, for obvious reasons).
That left him unable to walk or speak properly for months and he still hasn't and probably will never fully recover. Just watch videos of him from a few years ago and compare them to videos from recently.
I get that benzos is being studied as a potential treatment for depression, but he was doing massive quantities, and not as part of a pharmaceutical trial.