a drug family is much more specific than drug class (i.e. stimulant, depressant, opiate, and hallucinogen) in that all drugs in a drug family affect the body in a similar manner through means of similar chemical structure. Examples of this include:
The Phenethylamine Family:
The Tryptamine Family:
The Cannabinoid Family:
Marijuana is in the cannabinoid family.
A 'family' of the 6 most common drugs.
Marijuana, Speed/Ice, LSD, Ecstacy, Cocaine and Heroin
"Have you done any drugs outside the immediate 'drug family'?" (ie. DMT, 5-Meo-Dit, Datura)