It causes all kinds of health risks
9.2.2 Nonmailable by Government Misrepresentation A solicitation that misrepresents a government entity is nonmailable subject to these conditions: Matter that contains a solicitation for products, services, information, or funds that implies any federal government connection, approval, or endorsement through the use of a seal, insignia, reference to the Postmaster General, citation to a federal statute, name of a federal agency, department, or commission, or program, trade, or brand name, or any other term or symbol
Again the question of how many packs in a carton of cigarettes arose and it was decided that 10 packs per carton
10.1038/ncomms2494 136 MorensD