As the sports world battles the use of performance-enhancing drugs, one substance almost always slips under the radar — cannabis. But according to the new book “Runner’s High” (G.P. Putnam’s Sons) by Josiah Hesse, its use is rife in professional sports. Former Denver Nuggets basketball player Kenyon Martin estimates that 85 percent of the players in the NBA use cannabis. Ex-Philadelphia Flyers enforcer Riley Cote reveals that at least half the players in the NHL do…