Use of amphetamines can cause an individual to become psychologically dependent on to them so that they are so central to a person's thoughts, emotions, and activities that the need to continue their use becomes a craving or compulsion.
When someone stops drinking alcohol, his or her blood alcohol level decreases by around 0.01 percent per hour.
Rock or crack cocaine can be easily be smoke, the most common form of use in the streets.
The withdrawal symptoms associated with use of crystal meth are the same as the regular powder form of methamphetamine, but in some cases more severe with hallucinations, paranoid ideation and toxic psychosis.