Drug info - king size vs. 100's?

[Metternich]

What is the difference in size between King Size and 100 type cigarettes? Which one is more typical?

This sounds odd, but I ask this because Swim is buying a cigarette case for a friend, and it is advertized as holding 18 king size cigarettes and Swim was wondering if it is something that would be practical for every day use.

And neither I or Swim really smoke, so we are clueless..

[pickledsheep]

In Canada most cigarettes are come in regular or king sizes, to my knowledge having only Benson and Hedges 100s as the exception (and those More 120s). And a pack typically contains 20 or 25, so holding 18 seems strange.