drug antagonism.
Counteraction.
antagonist
One term for it is potentiation.
A biophase is a pharmacological term for the effect site of a drug.
Medicine could be another way to mean drug.
Adverse Drug Reactionside effect
Ganja is a term for the drug Marijuana. There are a number of different terms for Ganja including weed and pot. In some countries the drug has been legalized.
addiction
It describes a drug that is not perscribed by a physician that is taken to obtain a "high" or other desired side effect.
Aerodynamics
tolarance
An antiinfective is another term for an antiinfectiion - a drug which prevents or counteracts infection.
The slang term "crank" is another word for the illegal drug meth ampetamine.
As per the drug itself - it has a short term effect on a person. With that said - the consequences of years of use is certainly causing long term effects.