Las Vegas Review-Journal, 05 Apr 2013 – To the editor: In response to Michael O. Kreps’ March 23 letter, "War on drugs does nothing but harm": I couldn’t agree more. After countless studies of the effects of marijuana, starting with President Nixon’s commission, not one has reported any major harm caused by the use of this natural plant – unlike the gateway drugs tobacco and alcohol, I might point out. There have been many books written, "Marijuana Myth, Marijuana Fact" for one, by renowned physicians dispelling these myths created by critics.