Is the motivation to quit smoking greater if the smoker is going to quit smoking of their own free will or when advised by a health professional? oleh José I. de Granda-Orive, José Francisco Pascual-Lledó, Santos Asensio-Sánchez, Segismundo Solano-Reina, Marcos García-Rueda, Manuel Ángel Martínez-Muñiz, Lourdes Lázaro-Asegurado, Daniel Buljubasich, Susana Luhning, Rogelio Pendino, Isabel Cienfuegos-Agustín, Carlos A. Jiménez-Ruiz