Components of Cigarette Filters
"A plug or a cap, with which the majority of cigarette filters are made, is composed of cellulose acetate – a plastic. The balance are made from papers and rayon. The cellulose acetate tow fibers are finer than even sewing thread. They are white in color and packed tightly together to create a filter. At first glance they look similar to cotton.”
Are Cigarette Filters Effective?
"The majority of cigarettes filters bear ventilation holes punched around the circumference of the filter tip. The ordinary cigarettes might have one ring of ventilation holes, but light and ultra-light cigarettes might boast two or more rings. These tiny holes can be viewed in bright light by holding the unrolled paper up. The property of these ventilation holes is to allow enough fresh air into the smoke. So these cigarettes test low in tar and nicotine levels when smoked, if they are uncovered by the user.
If smokers’ fingers or lips cover some of these holes as they puff, this action can result in giving them much higher doses of tar and nicotine than advertised. Critics of the tobacco industry slam this feature by arguing that the holes create a flexible dosing system allowing addicted smokers to maintain the tar and nicotine levels they crave while falsely believing they are inhaling lower, safer doses.”