Bryan Johnson· Author
the PM 2.5 levels when we were there, I think they averaged around 75 to 120 depending upon the city we were in. And that's equal to around 3 to five cigarettes per day.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
the PM 2.5 levels when we were there, I think they averaged around 75 to 120 depending upon the city we were in. And that's equal to around 3 to five cigarettes per day.
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