Weed Is Now Legal For Olympic Athletes

Then, in 2013, WADA quietly changed their rules, a fact that a lot of people missed because most people aren’t keeping a close eye on the World Anti-Doping Agency’s list of banned substances. In 2013, they added a zero to the 15, making it 150 ng/ml of THC. Basically, weed is the same as alcohol for Olympic athletes now–don’t show up drunk, stoned, super hungover, or reeking like last night’s bong water, and you’ll be just fine.
Which means, of course, that athletes in Rio are technically allowed to smoke weed–just not during competition (which would be difficult anyway, because they’re usually busy doing something really hard really well) or within a few days of competing. On their own time, however, they’re free to smoke as much weed as they want… which is the way it should be, because smoking weed’s not really that bad. - theinertia.com