to ban smoking or to quit smoking

医院是禁烟区，请不要在这里吸烟。

verb · the practice of prohibiting lighting fires for cooking, typically associated with the Cold Food Festival

寒食节期间，民间有禁烟冷食的习俗。

verb · prohibition on the sale and use of opium, especially during the Qing dynasty in China

林则徐在广州组织了声势浩大的禁烟运动。