The cilia, or small finger like projections, will attempt to clear the oil deposits away. However, this is usually a timely process and medical attention is indicated. Risks of Smoking and Diving While Smoking can not actually be described as a diving injury, it can be a risk factor for some of the diving injuries we have covered. Long term usage of cigarettes can cause pulmonary disease, which obstructs the terminal airways and can produce air-filled dilations. These small spaces of trapped air can expand upon ascent and can increase one's risk of pulmonary barotrauma and arterial gas embolism.
Smoking also results in increased bronchial mucous production and paralysis of the cilia.
This is a bad combination for divers. The mucous is not being removed, leaving it available to form plugs in the lungs which creates air-filled sacs. Like the air-filled dilations, the sacs can expand and possibly rupture upon ascent. Additionally, most smokers have problems with nasal and sinus drainage. This can greatly increase one's risk of middle ear blocks and middle ear squeeze.