The size of a pack is often regulated. Government agencies usually set a minimum pack size.
In Australia, the most common quantity per pack is 25, second to 20 which by law, is the minimum. 30, 40 and even 50 packs are also sold.
In Canada, most packs sold have 25 cigarettes, but packs of 20 are also popular.
In many European countries, increases of cigarette tax can cause the quantity of cigarettes in the pack to change, in order to achieve the same end price.
In Malaysia, the selling of packs containing less than 14 cigarettes is prohibited.
In the United States of America, the quantity of cigarettes in a pack must be at least 20. Certain brands, such as Export As, come in a pack of 25.
In the United Kingdom brands are usually sold in packets of 20 but most popular brands are also available in 10s. Vending machines often dispense packets containing 16 or 18 cigarettes, although the dimensions of the packaging are the same as the equivalent packet containing 20.[1]