It is far more powerful, and cheaper, and prevents sleep - that is the most dangerous. The tendency to re-dose is high enough to be difficult for low-willpower people to not succumb to.

Heroin, opiates, and opoids, can also be used with a relatively decent risk-profile. The potential for addiction is higher, once tolerance is established.

Xanax makes meth and heroin look like kid's toys.

Don't take Xanax except for when you genuinely feel like you may hurt yourself.