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 Marijuana is the  world's most popular illicit drug, with hundreds of millions of regular  users worldwide. One in three Americans has smoked pot at least once.  The Drug Enforcement Agency estimates that Americans smoke five million  pounds of marijuana each year. And yet marijuana remains largely  misunderstood by both its advocates and its detractors.
 To some,  marijuana is an insidious "stepping-stone" drug, enticing the  inexperienced and paving the way to the inevitable abuse of harder  drugs. To others, medical marijuana is an organic means of easing the  discomfort or stimulating the appetite of the gravely ill. Others still  view marijuana, like alcohol, as a largely harmless indulgence,  dangerous only when used immoderately. All sides of the debate have  appropriated the scientific evidence on marijuana to satisfy their  claims. What then are we to make of these conflicting portrayals of a  drug with historical origins dating back to 8,000 B.C.?
Understanding  Marijuana examines the biological, psychological, and societal impact  of this controversial substance. What are the effects, for mind and  body, of long-term use? Are smokers of marijuana more likely than  non-users to abuse cocaine and heroine? What effect has the increasing  potency of marijuana in recent years had on users and on use? Does our  current legal policy toward marijuana make sense? Earleywine separates  science from opinion to show how marijuana defies easy dichotomies.  Tracing the medical and political debates surrounding marijuana in a  balanced, objective fashion, this book will be the definitive primer on  our most controversial and widely used illicit substance
