the world's most popular psychoactive drug may have a disturbing hidden effect on some of its habitual users. Heavy drinkers of coffee, tea, energy drinks, and other caffeinated beverages are more likely to hallucinate, hear imaginary voices, and even sense the presence of deceased people, a new study suggests. Caffeine is much loved for its ability to quickly increase alertness, boost energy, and improve mood. Its effects include relief from pain and headaches and the easing of asthma symptoms. Others have suggested possible correlations between caffeine use and cancer, fibrocystic breast disease, and osteoporosis. __
