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Cigarette butts on the ground Captions are provided by our contributors

"We're a commercial lab here to make money," said Bryan Tyler, a representative of Enthalpy who handled the Journal Sentinel's testing request

"If you look at people with mental illnesses, lower socio-economic Indigenous people, and other marginalised or stigmatised minority groups like LGBTI communities, you will find much higher smoking prevalence rates," said Marewa Glover, associate professor of public health at Massey University in New Zealand

A less-risky method: culling small amounts of tobacco from cigarette butts found along roadsides and other work sites