Usually that does not happen, but drugs such as heroin and amphetamines may cause a craving, even after the first use. Once someone has tried a drug he may want to continue to use the drug, thus developing and dependence and addiction. Having obsessive thoughts and creating schemes to get more of the drug may be a sign of addictive tendencies. All illegal drugs are risky and should not be experimented with, however, once a person is addicted to a drug seeking proper treatment is one of the most important issue.

Alcoholism and drug addiction differ only in the type of substance abused. Alcohol is in a liquid form. Alcoholics and drug addicts both suffer from a dependence, tolerance and obsession with a mind–altering substance. Both are progressive diseases and both are treatable through abstinence and rehabilitative treatment.

They are:

• Cocaine
• Heroin
• Morphine
• LSD
• Marijuana
• Sedatives
• Speed
• PCP
• Ecstasy

Legal drugs that are used improperly or without a prescription, such as:

• Narcotic painkillers
• Amphetamines
• Drugs for treating anxiety
• Sleeping pills