it's tough. it requires persistence, patience and luck. >> this is josh stanley and his five brothers. they're a handsome, well-educated tight nit group, all working together to make millions in colorado's cannabis madness. how have things changed here? >> you're looking at a new crop. this is a never-ending cycle. >> the stanleys sell many different kinds of medical marijuana. high thc strains tend to be the money makers, but they're now famous for growing a less profitable plant called charlotte's web. it's low in thc but high in cbd, cannabidiol. remember that name. it's the key chemical doctors are using to treat everything, from chronic pain to lupus, to crohn's disease and epilepsy. so 80% of this farm is now a