Everything is toxic.
Drink too much water and you'll get potentially fatal water poisoning. Breath too much - hyperventilaton can cause really nasty things
This is always the first reaction when someone brings up toxicity of alcohol in a pub, including the Paracelsus quotation. But it misses the point: alcohol is very toxic in the small amounts consumed while drinking "in moderation", water isn't. There is a good reason why we usually avoid some substances.
Alle Dinge sind Gift, und nichts ist ohne Gift, allein die Dosis macht dass ein Ding kein Gift ist.
All things are poison, and nothing is without poison, the dosage alone makes it so a thing is not a poison.