Question

1. when people talk about recreational drugs, what definition of \drugs\ are they using?

chemicals available only by prescription from a licensed medical professional
illegal chemicals without any legitimate medical use
mood - altering chemicals derived from plants
nonfood chemicals that alter the way a person thinks, feels, functions, or behaves

Explanation:

Recreational drugs are non - food chemicals. Their main characteristic is that they can change a person's thinking, feeling, functioning, or behavior. Prescription - only chemicals (first option) are mainly for medical treatment. Illegal chemicals without medical use (second option) is too narrow as some recreational drugs may have had historical or limited medical uses in some contexts. Mood - altering chemicals derived from plants (third option) is also too restrictive as recreational drugs can be synthetic or from various sources.

Answer:

nonfood chemicals that alter the way a person thinks, feels, functions, or behaves