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Well, one night camping out for a concert in the cold equaled pneumonia about a week later. That's my experience.

Correlation is not causation.

Did you ever camp out in the cold and not get pneumonia? I've been camping and hiking in sub-zero temperatures, and I didn't get sick. Camping in cold weather does not cause pneumonia.

Correlation is not causation.

But when I was in high school, I got pneumonia. This was in sunny Beverly Hills, California. Stress can impair immune system function, and I was diagnosed the day before I was to represent my school in the LA County Academic Decathlon. The preparation had been going on for six months, and I was extremely stressed out. (Against doctors orders, I went anyway; we won!) But none of the other team members were sick. Competing in academic competitions does not cause pneumonia,

Correlation is not causation.

Another coOn July 7, 1989, I saw a Grateful Dead concert at JFK Stadium in Philadelphia. Six days later, the building was condemned.

Does that mean that my attendance at GD concerts causes the venues to be condemned?

Less than a week after that concert, I attended another GD show at RFK Stadium in DC. It was not condemned.
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