Thats K2. It causes vision problems and the rough equivalent of brain damage.
Its nothing like weed besides a similar buzz.
Weed has been used for god knows how long, is incredibly effective, and has few risks besides perhaps causing some plaques that can limit brain function long term, but that may simply due to lack of heavy thinking while high, the plaque can be prevented by using your brain regularly, similar to how people who dont think much seem to get Alzheimers easier...but still is much safer than alcohol in that regard.
Xanax is a beautiful drug, one of my favorites and one that I use atleast a few times a month.
As far as I have observed, no affects on muscle built, if anything it significantly enhances recovery with great sleep.