Do birds use cigarette butts in their nests because the toxins left in cigarette filters deter parasites? (treehugger.com)
The documents show oil companies tested toxicity in cigarettes in the 1950s, and some, including Exxon and Shell, patented cigarette filters worldwide for decades. (scientificamerican.com)
South Korean chemical engineers successfully converted used cigarette filters into a type of porous carbon ideal for conducting electricity. (discovermagazine.com)