( thick mucus in the nose and the throat that wants to escape the body).Prolonged use may lead to emphysema and the need to hook up to a machine to pump enough oxygen into the lung. Another effect of this habit is that smoking breeds or produces halitosis; a smoker's breath always smells foul and repulsive. Smoking frequently results in social isolation because fewer people smoke or want to be in the presence of second-hand smoke. Friends and acquaintances often bluntly tell their smoking friends that they do not want the smell in their cars on in their homes.