1 drink = 1/2 pint of beer or 1 glass of wine or 1 single spirits.
1 unit of alcohol = 10cc of alcohol. So, a small glass (125cc) of 12% wine is 12.5 * 0.12 = 1.5 units.
How often do you have EIGHT or more drinks on one occasion?
How often do you have SIX or more drinks on one occasion?