[cwkoss]

I think even the narrow definition includes drugs more dangerous than alcohol.

Chemicals like https://en.wikipedia.org/wiki/25I-NBOMe#Toxicity are among the most potent agonists of the 5-HT2A receptor, and are also extremely dangerous due to potency and their vasoconstrictive and cardiovascular effects.

(There are horrifying stories of people being sold "acid" and then their lips turn blue from vasoconstriction and subsequently need hospital intervention - see: https://www.erowid.org/experiences/subs/exp_25INBOMe_Health_...)

A significant number of the deaths the nbom family has caused can probably be attributed to the difficulties of clandestine dosing in microgram amounts, but I think they may still be more dangerous than alcohol even when dosed accurately. It's certainly more dangerous for naive users without the proper equipment to measure and handle it.