What are the features of abuse & addiction to crystal meth?

There are a range of features attributed to crystal use; the most typical physical features are dehydration, lack of appetite, sleep deprivation and loss of weight. There is also a broad range of psychological features depending on the amount of crystal used and how long one has been using. The features may start as a slight irritability and or nervousness but could develop into paranoia, anxiety, compulsive behaviors and psychosis.