Wow, marijuana news is hitting a feverish pitch lately, especially with that most-winning "Olympian pothead" making news.
I am glad to see studies like this being performed. If you are a pot smoker, keep in mind that taking smoke in your body in any form is unhealthy.
I suspect that eventually one state (Nevada?) will attempt to legalize it and the house of cards will begin to fall in the US. Until then, big business (pharma?) who controls Congress isn't going to let it happen without a fight.