SMOKERS ARE UNAWARE OF THE FILTER VENTS NOW ON MOST CIGARETTES

Lynn T. Kozlowski, Marvin E. Goldberg, Berwood A. Yost, Frank M Ahern, Keith R Aronson, Christine T. Sweeney, Tobacco Control, Volume 5, 1996.

Objective - To evaluate awareness and knowledge of cigarette filter ventilation in a national probability sample of smokers of Ultra-light, Light, and regular cigarettes.
Design - Random-digit-dialing and computer-assisted interviewing was used on a probability sample od daily cigarette smokers (ages 18 and above).

Subjects and setting - 218 Smokers of Ultra-light cigarettes, 360 smokers of Light cigarettes, and 210 smokers of Regular cigarettes living in the continental Unted States.

Main outcome measures - Percentage of respondents indicating knowledge of the presence of filter vents and the consequences of behavioural blocking of vents.

Results- Many smokers had not heard about or seen the filter holes: 43% (95% CI 36 to 50%) of smokers of Ulra-lights, 39% (95% CI = 34 to 44%) of smokers of Lights, and 47% (95% CI = 40 to 54%) of smokers of Regulars. About two in three smokers either did not know of the existence of rings of small holes on the filters of some cigarettes, or did not know that blcking increases tar yields: 69% (95% CI 63 to 75%) of Ultra-lights, 66% (95% CI 61 to 71%) of Lights, 69% (95% CI 63 to 75%) of Regulars.

Conculsions - Smokers are generally unaware of the rpesence and function of filter vents - a major design feature subject to behaviouralblocking by smokers and now present on most cigarettes in the United States. Smokers and policy-makers need to be informed about the presence of filter holes and how vent blocking increases tar and nicotine yields from ostensibly very low-yield cigarettes.