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| | Addiction |
 | | Also, it should be noted that some highly addictive drugs (so-called hard drugs), such as cocaine, induce relatively little physical dependence, whilst other drugs (so-called soft drugs) such as magic mushrooms and peyote are not normally considered to give rise to any significant degree of addiction or dependence. |
 | | Not all doctors do agree on what addiction or dependency is*, particularly because traditionally, addiction has been defined as being possible only to a psychoactive substance (for example alcohol, tobacco, or drugs), which is ingested, crosses the blood-brain barrier, and alters the natural chemical behaviour of the brain temporarily. |
 | | While opioids, benzodiazepines, barbiturates, alcohol and nicotine are all well known for their ability to induce physical dependence, other drugs share this property that are not considered addictive: cortisone, beta-blockers and most antidepressants are examples. |
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