Although it was once believed to be a non-addictive substance, cocaine is actually one of the most highly addictive illegal drugs in America. Crack cocaine is a modified version of cocaine that is even more addictive and has similar effects on the user.

Crack, also called crack cocaine, is a modified form of cocaine that is smoked by the user. This route of administration produces a much faster and more intense high than snorting cocaine because the smoke is absorbed into the lungs and immediately enters the bloodstream.

Methamphetamine - also known as crystal meth, meth, crystal, ice, speed, and crank – stimulates the central nervous system and produces a feeling of euphoria and focus in the user.

Heroin is an extremely addictive illegal substance. Like most opioids, it is derived from the sap of the opium poppy [Papaver somniferum]. Heroin is a central nervous system depressant and creates an intense feeling of relaxation and euphoria in the user.

Marijuana is dried plant material that from two species: Cannabis Indica and Cannabis Sativa. Users smoke or eat the substance. The active chemical in marijuana is tetrahydrocannabinol (THC).

Oxycontin is a prescription opiate used to treat the severe pain associated with such medical conditions as cancer and spine injury. Like most opiates, Oxycontin is derived from the sap of the opium poppy [Papaver somniferum] and is a central nervous system depressant.

Addiction to prescription drugs has become much more prevalent in the past several years particularly among adolescents. Regardless of age, addiction to prescription drugs can become a debilitating illness that often robs the addict of everything they once valued.

Like heroin and oxycodone, the hydrocodone in Vicodin is an opiate. Opiates are derived from the sap of the opium poppy [Papaver somniferum] and depress the central nervous system and relieve pain. Vicodin is a very commonly prescribed medication and is thus much easier to obtain than many other opiates.

Xanax belongs to a class of drugs know as benzodiazepines which includes other well known prescription drugs such as Valium, Klonopin, and Ativan. These drugs are central nervous system depressants and are prescribed in the treatment of anxiety disorders. As one of the fastest acting benzodiazepines, Xanax very quickly produces feelings of relaxation in the user which is one of the reasons it is so addictive.