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Public Health 91 , 206212 (2001)

Natural Resources Canada identifies that just over half of wildfires are caused by humans, with the source being anything from campfires, damaged electrical systems, out-of-control burns, or lit cigarettes

Cigarette package inserts can promote efficacy beliefs and sustained smoking cessation attempts: A Longitudinal assessment of an innovative policy in Canada

In most cases, these are remnants of plastic products that remain in the environment due to mechanical degradation in fact, conventional plastic from petroleum products does not undergo material degradation but only mechanical degradation