Substance dependence, also known as drug dependence, is an adaptive state that develops from repeated drug administration, and which results in withdrawal upon cessation of drug use.[1][2] A drug addiction, a distinct concept from substance dependence, is defined as compulsive, out-of-control drug use, despite negative consequences.[1][2] An addictive drug is a drug which is both rewarding and reinforcing.[1] ΔFosB, a gene transcription factor, is now known to be a critical component and common factor in the development of virtually all forms of behavioral addiction and drug addictions,[3][4][5] but not dependence.
One study tracked the weekly drug use among individuals who attended residential treatment centers. After one year post discharge they discovered that there is a correlation between retention rates and the length of stay at a facility. Individuals coming form programs of 90 days or more showed a lower relapse rate than those coming from programs of less than 90 days. Drug Addiction : How to Help Someone with a Meth Addiction

Remember though, overcoming alcoholism is a process. Less than half of individuals relapse after achieving one year of sobriety. That number reduces to less than 15 percent who relapse after five years of sobriety. For the greatest chance of long-term sobriety after completing an inpatient or outpatient program, you should participate in local support groups and continue with counseling. Treating alcoholism is an investment in your future. It will not only make a huge difference in your life, but also the lives of those around you such as family members and friends.

Stimulants, such as tobacco, cocaine or prescription amphetamines, stimulate the brain and nervous system, causing increased alertness. Depressants, such as barbiturates and benzodiazepines, slow activity in the brain and nervous system, causing relaxation. Hallucinogens, such as LSD and PCP, drastically disrupt the way the brain and nervous system communicate, causing hallucinations. Rehab: Last Week Tonight with John Oliver (HBO)
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