California residents, here is the interstate statute per State Board of Equalization:
If consumers purchase cigarettes or tobacco products for their own use from outside the state without paying California excise tax, they are required to report and pay the tax directly to the BOE. This includes products purchased through the mail, by telephone, or via the Internet, that are shipped into California. Consumers also owe the taxes if they physically bring more than 400 cigarettes into California. These purchases are also subject to California use taxes. For information regarding California use tax, please visit
www.boe.ca.gov/ sutax/usetax.htm#Overview
Not to worry, but just a heads up.