Cigarette butts contain chemicals that may keep steel from rusting
It has been estimated that every year, 4.5 trillion cigarette butts are added to the world’s ecosystem. That would be bad enough if they were simply disgusting, but when they’re left on beaches or washed down storm sewers, they can be lethal to fish. Unfortunately, there’s nothing that can be done with the butts, other than throwing them out... until now, perhaps. Researchers from China’s Xi’an Jiaotong University claim that cigarette butts can be used to make an excellent rust inhibitor.