Emissions from diesel vehicles have been reported to be significantly more harmful than those from petrol vehicles. Diesel combustion exhaust is a source of atmospheric soot and fine particles, which is a component of the air pollution implicated in human cancer, heart and lung damage, and mental functioning. And people care two shits about the smell of pot smoke. this is why humans are so lame. study's like this are a waste of a human mind and time. thanks for showing us how far gone the minds of most people are. pot smoke , never will be a public problem .