Alcohol is a poison, not a drug, but I also think so.
I honestly wish mind-altering drugs were more accessible sometimes, mostly because of safety. Millions are killed by adulterants in their street drugs.
Poison is a function of dosage. Water is a poison in a high enough dose.
What’s you’re arguments it’s not a drug?
As the saying goes: “the dose makes the poison”. Many (perhaps most) drugs cause harm at the wrong dosage.