system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When I drank for the first time, 3 drinks made me feel drunk. 4 years later I can probably drink 3x that and feel the same (thanks college). If these two me's were breathalyzed, would we both produce the same BAC, or is my body now just more used to the feeling of 3 drinks?
gpt
Your BAC is constant; tolerance merely refers to how much a given amount of alcohol affects your judgment, inhibitions, etc. So drinking the same amount of alcohol with the same body mass will yield the same BAC, but you won't feel as drunk.

This is also assuming that your metabolism has not changed in how quickly it processes alcohol.