Harmful substances in cigarettes such as nicotine can circulate through the blood to various organs and reach the brain in seconds.

• 吸烟会令大量有害化学物质如尼古丁迅速透过血液传送至身体不同器官及大脑，影响身体抗氧化功能，并有机会引致呼吸系统、环系统、化系统及口腔等疾病。