I like diesels 
Then you are guilty of manslaughter. Diesel particulates are proven carcinogens and are probably responsible for more lung cancers than are blamed on smoking. But it is easier and less problematic to blame fags than to address the problems that would arise from sorting out all the heavy machinery/lorries/buses etc. that are diesel.
Remember all those Beagles that were forced to smoke 10's of thousands of fags to study lung cancer? Not one of them developed it. Not one. Then they realised the hounds were all breathing laboratory purified air, so they changed the supply to take in the air from the busy A road nearby and guess what...