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9.5.2 Foreign Origin Mail of foreign origin is nonmailable if it contains matter determined by a court of competent jurisdiction or by the International Trade Commission to violate the Semiconductor Chip Protection Act of 1984 (17 USC 901-914) or to violate the copyright laws of the United States or any copyright convention or treaty to which the United States is a party (17 USC 601-603)

At least 70 are known to cause cancer in people or animals

Once nicotine levels drop in the body, this produces aforementioned feelings of cravings, as well as physical withdrawal symptoms

However, if you plan to bring them in your carry-on, make sure they don't have circular thread-cutters or other blades