Increasing use of stimulants warns of potential abuse

SIR — Your Editorial ‘Defining natural’ (Nature 452, 665–666; 2008) indicates that cognitiveenhancing drugs have only mild effects similar to caffeine, and the News story ‘Poll results: look who’s doping’ (Nature 452, 674–675; 2008) highlights the general increase in their availability through Internet purchase and possibly diversion of prescriptions. By… CONTINUE READING