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Experimental bronchitis in lambs exposed to cigarette smoke.

The effects of cigarette smoke administered to 18 lambs through a tracheostomy tube showed that bronchitis could be produced within five weeks. A dose-related response was seen between animals which smoked four and eight cigarettes a day. Mucus production was measured over 24-hour periods and amounts of PAS-positive material was measured from histological sections of trachea and left main bronchus using image-analysis computing techniques. Goblet cell numbers and size from counts and area evaluations were not conclusive, but the tracheal and bronchial gland hyperplasia showed a significant dose-related response. This animal model is considered to be useful in producing a grading of irritation which assists in the evaluation of various types of cigarette smoke.