Why some people who drink a lot and have been for many years may not appear to be drunk after consuming a lot of alcohol?

Some individuals who consume large amounts of alcohol over many years may develop a high tolerance, meaning their bodies become accustomed to its effects. This tolerance can mask signs of intoxication, allowing them to appear sober even after consuming significant quantities of alcohol. Additionally, factors such as genetics, metabolism, and habitual drinking patterns can influence how alcohol affects a person. Consequently, they may not exhibit the typical behavior associated with drunkenness, even when their blood alcohol levels are high.