Meth is so addictive that some people may become addicted after just a few uses.
Heavy users tend to experience hallucinations and delusions. Some users develop sores on their face or body when they have been picking at their skin, thinking that there are bugs crawling under their skin that they can’t see.
Because of the caustic nature of the chemicals and the fact that the drug dries up the flow of saliva, a meth addict’s teeth may get rotten and brown. This is referred to as “meth mouth.”