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INSERTION DEPTH STUDY ON SWISS CIGARETTES The depth of insertion of a cigarette between the lips is one way whereby a smoker may, consciously or unconsciously, influence the degree of ventilation of ventilated cigarettes. This is a well known aspect of smoking behaviour and several authors referred to the interference with lips on ventilated cigarettes well before channel ventilated cigarettes entered the market. B.A.T. (SUISSE) decided in 1984 to carry out a large survey on the Swiss Market to determine the maximum insertion depth of cigarettes into a smoker's mouth in order to find out whether ventilation systems are blocked by smokers lips and if the blocking of ventilation occurs to see whether this is dependent of cigarette design or filter type. Principle of method used : The imprint of smoker's lips is made visible via the oc - amylase of saliva. The amylase is transferred from the tipping paper onto a wet, starch impregnated, strip of silica gel on aluminium foil. After incubation for 10 - 20 minutes at 37 o C, the strip is sprayed with iodine solution. White areas on a blue background indicate the position of the lips on the tipping paper. Results : The arithmetic average of insertion depth on 24 ventilated brands is 12 mm covering a range from 4 to 25 mm. Analysis of individual brands clearly indicates that highly ventilated cigarettes are inserted deeply into the smokers mouth and consequently the ventilation level is reduced during normal human smoking. N cn 0 V N O, CO CIt W ~ HI/ad-28.02.89 (Insertio/B3)

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