Individuals who are addicted to heroin will endure many of the withdrawal symptoms to reduce their tolerance for the drug, only so they can once again experience the rush.
Studies indicate that PCP use may impede the learning process in teenagers.
Most individuals with a history of chronic drug addiction are polydrug users (users of more than one drug) and will require drug rehab for all of the substances that they abuse.
Withdrawal symptoms that occur because of cessation after long-term inhalant abuse can include weight loss, muscle weakness, disorientation and depression.