Bronchial asthma associated with smoking it?

Smoking can trigger asthma, cigarette-stimulating non-specific, so people with asthma should not smoke, have been smokers should quit smoking and it is not smoggy in the work environment and learning. Smoking-induced asthma, mainly on the tar content in cigarettes, nicotine acid and hydrogen cyanide and other harmful components. Nicotine may act on the autonomic and so on, can stimulate the vagus nerve caused by bronchial spasms. Tar can cause bronchial epithelial hyperplasia and the variation. Hydrogen cyanide acid damage bronchial epithelial cells and their cilia, so that the increase in bronchial mucous secretion of mucus, increased airway resistance, so that the purification of lung function and reduced activities of the cilia, the reflex to cause bronchospasm. So smoking may directly or indirectly caused by bronchospasm, which induced asthma.