The 18th Amendment to the US Constitution allowed you to continue using alcohol, and also to make it for your own consumption. What was prohibited was its commercial manufacture and distribution.
As a result, cirrhosis death rates for men dropped by two-thirds. Admissions to state mental hospitals for alcoholic psychosis halved. The homicide rate, which had soared between 1900 and 1910, did not increase significantly during Prohibition.
Prohibition was ended in order to raise taxes for the Federal Government. It was supported by labor unions and wealthy industrialists.
The 21st Amendment, which repealed the 18th Amendment, made unregulated imports of alcohol illegal.
During Prohibition, national alcohol consumption decreased by an estimated 30 - 50%. After repeal, it increased. In 1989, alcohol was implicated in over 50% of homicides (and drugs in 10 - 20% of them). Alcohol was then also believed to be the cause of over 23,000 motor vehicle deaths - more than twice the number of drink-related homicides.
Iceland banned beer for 73 years (1915 - 1988). But for the first thirty years of its existence, Pakistan allowed the free sale and consumption of alcohol; restrictions were only introduced in 1977.