Under The Influence

Under the influence of alcohol defines someone not in control of their body. The head and body are effectively separated. It is illegal to drive a car while in this condition. When under the influence of drugs (even nicotine) this may not be regarded as illegal. Still under an influence with an altered perception.

Anyway, if someone argues that smoking cannabis doesn't constitute being under an influence, why do people smoke it? It must have some effect or there would be no point doing it. Getting a fix of nicotine satisfies a physiological need. Getting a shot of alcohol gives the user the desired effect. To be intoxicated. To be placed under the influence of a drug.