A drug is any chemical substance, other than a food or device, that affects the function of living things. Technically, vitamin E, oxygen, and cocaine are all examples of drugs. Various drugs can be used to treat illness, or they can be used recreationally to alter behavior and perception.

The definition is somewhat fuzzy, because many substances which are not typically considered drugs are indeed active substances (ex. caffiene, nicotine, and even chocolate). Additionally, there are thousands of substances in foods and "nutritional supplements" which affect the function of living things. Many illegal and recreational drugs (such as cocaine, opium, and ephedra) could potentially be considered "foods" because they do have caloric content. That being said, the popular definition of a drug is any substance which causes an altered state of mind, caffiene and alcohol excluded. This may or may not include medications, which are strictly used to cure illness and by definition not used for recreation.

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Breast Cancer News: Four commonly used chemotherapy drugs disrupt birth of new brain cells, shows study: Researcher... http://bit.ly/5x4WYJ
BreastCancers (News-Medical.Net) Fri, 18 Dec 2009 11:00:22 -0000
Breast Cancer News: Four commonly used chemotherapy drugs disrupt birth of new brain cells, shows study: Researcher... http://bit.ly/5x4WYJ
Oncology News: Four commonly used chemotherapy drugs disrupt birth of new brain cells, shows study: Researchers hav... http://bit.ly/5x4WYJ
Oncology_News (News-Medical.Net) Fri, 18 Dec 2009 11:00:22 -0000
Oncology News: Four commonly used chemotherapy drugs disrupt birth of new brain cells, shows study: Researchers hav... http://bit.ly/5x4WYJ
Chemotherapy: Autumn in January » Blog Archive » A letter to my chemotherapy drugs http://bit.ly/64lpAZ
lefernald (Fernald Leeanne) Fri, 18 Dec 2009 03:36:23 -0000
Chemotherapy: Autumn in January » Blog Archive » A letter to my chemotherapy drugs http://bit.ly/64lpAZ
Ϟ Best Antioxidant Vitamin Supplements • Discount Vitamin Shop ...: of children taking chemotherapy drugs in ou.. http://bit.ly/4zzZbu
PatientSafety01 (HPTG, inc.) Thu, 17 Dec 2009 07:33:33 -0000
Ϟ Best Antioxidant Vitamin Supplements • Discount Vitamin Shop ...: of children taking chemotherapy drugs in ou.. http://bit.ly/4zzZbu
Why Is Grapefruit Not Recommended With Chemotherapy Drugs, Such As Vinblastine? - http://tinyurl.com/ye9nngs
chemicallok (chemicall) Wed, 16 Dec 2009 08:39:25 -0000
Why Is Grapefruit Not Recommended With Chemotherapy Drugs, Such As Vinblastine? - http://tinyurl.com/ye9nngs
Chemotherapy Cancer Treatments & Side Effects : Types Of Chemotherapy Drugs: There is a variety of drugs used .. http://bit.ly/7XLMO2
lefernald (Fernald Leeanne) Wed, 16 Dec 2009 07:00:21 -0000
Chemotherapy Cancer Treatments & Side Effects : Types Of Chemotherapy Drugs: There is a variety of drugs used .. http://bit.ly/7XLMO2

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