Peak blood alcohol levels (about 1 hour after ingestion) increase with the number of drinks. In the USA, blood alcohol is commonly expressed as mg% (mg/100 ml) or grams/100 ml so that 80 mg% (the legal limit for driving in the USA) = 80 mg/100 ml - .080 g/100 ml. As blood alcohol levels increase, behavior progresses from mild euphoria and a mild decrease in inhibition to disinhibition, impaired reasoning and judgment to impairment of motor control and eventually to stupor and even death at high blood levels (about 400 mg%).