How is he use of amphetamines different from the use of inhalants
The use of amphetamines different from the use of inhalants because Inhalants can cause immediate brain damage while amphetamines do not.
Intoxication levels are theorised as different depending on the alcohol user. In addition, a user could already be intoxicated at a significantly lower Blood Alcohol Concentration which could be in a range of 0.02 - 0.03 BAC while some require a much higher Blood Alcohol Concentration. So it is basically dependent on the user.
I guess its medical, if not, philosophical