I met a bloke in Liege when I was with TNT there, he was in remission from the big C, and he reckoned he had categorical evidence that the unburnt hydrocarbons we all breathed in when we were working was the cause of his and many other cancers. Pause for thought ?
I'm being treated for Barratts oesophagus (never could spell it!) but I think mine was caused by too many hot curries!