The article itself isn't too bad, but most people don't read the article. The study itself is here... https://www.ajpmonline.org/article/S0749-3797(19)30468-4/fulltext …pic.twitter.com/2GEKIvnyJp
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Hard to know what that means considering it's cross-sectional tho. Could be a simple case of confounding - people who had strokes switched to vaping, so when you take a single snapshot you see an increased risk
That’s John Britton’s view. Cross-sectional studies with ex-smoking vapers have huge and obvious problems. https://www.sciencemediacentre.org/expert-reaction-to-study-on-smoking-vaping-and-stroke-risk/ …
Mmmm, definitely don't agree with everything he's said there, but generally he's correct. Reverse causation is probably the biggest issue here
Also, they didn't have a measure of duration of smoking, which is a pretty big issue. Could be that people who switch to vaping had been smoking for longer than current sole cigarette users
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