Humberto. It's beginning to look like drinking herbal tea makes people taller. They did a long-term study comparing a million adult herbal tea drinkers with a million adults who never, ever drink that disgusting rubbish. On average, the people in the herbal tea group got three millimeters taller for every year they drank herbal tea, while the demographically equivalent adults in the other group didn't grow at all.
Camila. Herbal tea doesn't make people taller. Plenty of people in that study drank herbal tea for years without getting any taller

Notice that the studies talk about the average gain in height.
If half of the people who drank herbal tea got six millimeters taller every year, and the other half didn't gain any height at all, what would be the average gain in height?
Do we have to prove that a cause always causes its effect in order to prove that it causes the effect at all?

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