Cigarette Butts' Toxicity Kills Fish

03/18/2010 05:12 am ET | Updated May 25, 2011

Even with a small amount of unburnt tobacco clinging to it, a single cigarette butt soaked for a day is enough to turn a liter of water a sickly yellow brown and kill 50 percent of fish swimming in it. Without tobacco, it takes about 4 smoked filters to do the same job.