A bit of legislative trivia. Note that Cigars are exempt.
The legislation titled “Prevent All Cigarette Trafficking (PACT) Act,” was passed by Congress and signed into law by President Obama on March 31, 2010.
Effective immediately, the U.S. Postal Service® cannot accept or transmit any package that it knows, or has reasonable cause to believe, contains nonmailable smokeless tobacco or cigarettes.
Cigarettes, including roll-your-own tobacco, and smokeless tobacco are considered “nonmailable” matter, unless the shipment falls within certain exceptions. The acceptance and transport of packages containing cigars is not prohibited under the Act.
Read More USPS.com.