
Sandslice |

It's a matter of GM discretion.
Based on GameMastery Guide, alcohol is treated more like a drug. Drugs don't have specific rules, but addictions behave as diseases.
Based on Ultimate Intrigue, the GM may decide that alcohol is a poison:
Quote:
Clever assassins may poison something that is supposed to have poison in it (such as alcohol). Even though ethanol alcohol (along with other possible food additives) is a neurotoxin, it doesn’t have its own poison stat block, and you’ll want to make your stance clear on poisonous substances not listed with specific poison rules to your players.

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By the rules, alcohol and all the drugs will kill very fast when compared with reality, and there is very little that helps to mitigate the effect.
Alcohol is a drug and alcoholism a disease, so, RAW, poison immunity will do nothing. As a GM I will consider it a poison.
With the rules for rum in the Skull & Shackles adventure, a person with 10 constitution will die in four days as a minimum and ten as a maximum.