“POR FAVOR APAGUE SU CIGARRO antes de entrar” (Please put out your cigarette before entering). “Gracias por no fumar” (Thank you for not smoking). These are among the model signs in the Manual de Señalamientos y Avisos of the State of Mexico, part of its program against tobacco use. They mark spaces where smoking is not allowed.
The same manual also offers the plain sign “PROHIBIDO FUMAR” (no smoking).