Smoking, according to Gwasira, along with eating strong flavoured food, is a common cause of transient halitosis. Smoking is also known to be an important cause of gum disease.
Her first recommendation is to give up the cigs. Failing that, she recommends following a cigarette with a good brush of the teeth or chewing on sugar-free gum “to increase the saliva flow in your mouth”. “That can help to get rid of the odour.”