Coffee drinking hazard

Nearly everybody enjoys a morning cup of coffee, and most research finds that's okay. But for those of you who drink many cups a day, like more than seven, you could be putting yourself at risk of seeing things that aren't there. New research has found those with a high caffeine intake were three times more likely to hear voices, sense non-existent people or hallucinate than those with low intake. So that old "I see dead people" thing was really just too much caffeine? Details here.