How come the people in areas such as Cumbria, Cheshire, Tyneside, Northumbria, Durham, Humberside, Lincolnshire, Nottinghamshire, Derbyshire, the West Midlands and Bedfordshire aren't all dead?
I grew up in Bedfordshire and it didn't do me any harm (although a couple of ex-girlfirends might disagree)
And it's been going on for a very long time so it's not very effective at killing people