Marijuana

[theVOID]

Drug: a substance that has a physiological effect when ingested or otherwise introduced into the body.

That's what i would have thought Adrian meant when he said

A "drug" is a substance that affects the human body.

For those who don't know, physiological effect = affects the normal function of living organisms and their parts.

If your food is affecting the 'normal function' of your body: I'd say you've got a serious problem

Or the chance to get wasted from a toasted sandwich - sounds like it would be awesome