I honestly thought you would be more insightful than that. If you truly don't want a definition that fully explains the meaning of the word drug, I'm going to have to give it to you.
"A drug... is any substance that, when absorbed into the body of a living organism, alters normal bodily function."
"A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction."
You can stop with the ad hominem, deagonx.
Were I silly, that would not affect the validity of my argument.
Were I little, neither would that affect the validity of my argument.
Were I silly and little, that, too, would not affect the validity of my argument.
I am neither silly nor little.
That said, you bring nothing of value or accuracy to the discussion with that particular labeling of me, DemonDuck.
IYO, drugs can be chickens for all it matters, but according to standard English, drug means the aforementioned. If you are using a differing dialect of English, please inform me. Not all drugs are manmade.
And finally, "affect" is a verb, and a noun meaning something completely unrelated. Talk to Craig about that.
"Effect" is the noun form of affect, and one that affects may have an effect.