Because caffeine consumption is usually a given in the general population, and significantly weaker than more specifically engineered and harder to acquire prescription drugs. Three pots of coffee in an hour is a poor equivalent to taking ritalin.
If I considered walking across the room as a form of workout, I could pretty confidently say that 99.99% of Americans exercise once a day. But that wouldn't yield me much in the way of insight.
If I considered walking across the room as a form of workout, I could pretty confidently say that 99.99% of Americans exercise once a day. But that wouldn't yield me much in the way of insight.