They have determined that there is no lethal dose of marijuana. And addictive potential is considerably lower than any other medicine available.
Among their findings, they have found that cannabis is not associated with adverse pulmonary function and does not cause lung cancer or any aerodigestive tract cancers. Cannabis does not cause other types of cancer either.
They found cannabis has great anti-tumoral activity. Through their testing they have determined that cannabis is more effective than conventional antiemetics (drugs that ease nausea). And inhaled marijuana was more effective in chemo-induced nausea than any other currently available treatment.
Some of their other findings are: Cannabis appetite increase at 75 percent compared to the most effective medicine that has a 49 percent increase; weight increase at 11 percent compared to the most effective current medicine that has a 3 percent increase.
In opiate resistant cancer pain, marijuana had significant pain intensity relief, substantial analgesic effects, antiemetic effects and appetite simulation.
They also proved THC to be more effective then codeine. Some 10 mg of THC was more effective then 60 mg of codeine. There was no increase of the THC dose needed in long-term pain management.
Inhaled THC was shown to be more effective in neuropathic pain than current medicine. It also showed improved sleep quality and sense of well being and less anxiety.
These are just some of the findings of the National Cancer Institute. (http://www.cancer.gov/about-cancer/treatment/cam/hp/cannabis-pdf)
The federal government has made it so no state can be prosecuted for implementing a medical marijuana program.