Darkis explained in this letter that L&M filters used a "highly purified alpha cellulose" that was "entirely harmless" and "effectively filtered the smoke"
J Autoimmun
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Usually, you would have to go into a gas station or convenience store to get them, but worst of all, there was little to no variation
To date, the FDA has identified nearly 7,000 chemicals in tobacco smoke, including known caustic and cancer-causing agents such as lead, cadmium, acrolein, acetaldehyde, benzene, ammonia, carbon monoxide, nitrosamines, and 1,3-butadiene
NNAL 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol is a Tobacco-Specific Nitrosamine (TSNA), which are a group of carcinogens found in tobacco and tobacco smoke