Definitions of the word: Drug

Drug: (noun)

§ Any substance , solid, liquid or gas, that changes the functions or structures of the body in some way, this excludes food & water, which are required to maintain normal functioning -ADF, (Sept 1997) How Drugs Affect You

§ Any substance that changes mood, feelings or behaviour - Retrieved 25 May 2004 from Alcohol Drug Association New Zealand website: http://www.adanz.org.nz/index.cfm/otherdrugs/