still just a drug

This isn't the first time I've read something like this, but BBC News Health reporter Michelle Roberts wrote about studies suggesting that for regular coffee drinkers, caffeine only brings them back up to baseline or "normal" levels of alertness: " 'People become immune to coffee boost,' experts believe."

"Although frequent consumers feel alerted by caffeine, especially by their morning tea, coffee or other caffeine-containing drink, evidence suggests that this is actually merely the reversal of the fatiguing effects of acute caffeine withdrawal," said Professor Peter Rogers, of Bristol University, and colleagues.

But Dr Euan Paul of the British Coffee Association recommended more research, adding: "Coffee when consumed in moderation, four to five cups per day, is safe and may confer certain health benefits, including contributing to your daily fluid intake."

Indeed. What would you expect him to say?