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Perhaps, as a start, Morales should ask Obama about the 1993 US Office of Technology Assessment Report "Alternative Coca Reduction Strategies in the Andean Regions" that instead concluded in favor of opening markets to Coca.
Such would mark a welcome change from the established jesuitical drug policy treason pushed through such entities as Georgetown University and the U.S. State Department.
Commissioned by the Office of Technology Assessment of the U.S. Congress, this report, dedicated to the official line that Coca cultivation ought to be reduced, Alternative Coca Reduction Strategies in the Andean Region, adopted from a contractor report prepared for the OTA in July, 1991, ended up presenting findings that contradict this dogma of official policy:...the utility of traditional coca consumption for Andean populations cannot be ignored. Three physiological benefits of coca use (for relief from altitude sickness, as a remedy to vitamin deficiencies, and in conserving body heat), are specifically appropriate to Andeans who must endure the stresses of high-altitude labor and a low protein diet. Evidence does not [emphasis added] support claims that traditional long-term traditional use is harmful. Rather, the multiple advantages of coca use indicate that it has a strong positive role in Andean health. 
Also, it would be useful for Morales to read a bit about the history of how the current anti-Coca laws came about in the early 1900s.