While the attacks were mostly personal, and not worthy of expounding here, the shred of substance was that more recent studies which compared lung cancer risks of successive cohorts of smokers have found increased risk among more recent cohorts. From these studies, the Surgeon General's report - and these co-authors - conclude that filters must convey an increased risk of cancer.

Recently, Professor Ashton went on what the Daily Mail called "" on Twitter. He made a number of rude and offensive comments about individual vapers, which cannot be repeated here. For details, see the Daily Mail or this of the story.

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