It varies. Macanudo "Ascots" come 10 to a tin. There are quite a few brands that also package 10 to a tin or box. It also depends on the ring gauge of the product.
10
In the US there usually 20 in a pack, 200 in a carton.
There are 10 packs of cigarettes in a carton. There are 200 cigarettes in a carton and 20 in a pack making it 10 packs a carton.
4-7 have to be in a pack to hunt or travel