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Obscene, lewd, lascivious, or filthy publications or writings, or mail containing information on where, how, or from whom such matter may be obtained, and matter that is otherwise mailable but that has on its wrapper or envelope any indecent, lewd, lascivious, or obscene writing or printing, and any mail containing any filthy, vile, or indecent thing is nonmailable (18 USC 1461, 1463)

Pragmatically, a piece of information creates its own demand

Psychological factors for tobacco addiction encompass stress relief, behavioral conditioning, and cognitive processes that reinforce smoking habits

These burn quite slow since they are so thin