https://www.usps.com/ship/domestic-tobacco-restrictions.htm [quote]With few exceptions, cigarettes and smokeless tobacco shipments cannot be mailed. This applies to domestic shipments, as well as inbound and outbound international shipments.
Cigars are still mailable domestically, as well as internationally, unless prohibited by the destination country.[/quote]
And again after the list of rules, in case the first time wasn't clear:
[quote]Note: these rules do not apply to cigars, which continue to be mailable matter.[/quote]