back with me now is montel williams that uses marijuana every day. dr. me, boston's children's hospital. dr. leevy, you heard what dr. sanjay says and montel who actively uses marijuana to deal with his pain successfully, why are you so opposed to this? >> well, i oppose medical marijuana, i want to start by saying i agree with a lot with sanjay and montel. so it's pretty clear that there are a lot of potential therapeutic events that are helping montel with his pain. there is canabadial helping the little girl in the documentary and as a physician, i think it's really important that we develop these as medications, and i'm not here to try and block patients who really need this -- really need the therapy from getting it. the issue is, though, that it's -- i would say as a medication, it's not really quite ready for prime time. there's a lot we don't know about it. we don't have a good idea how to do dosing. we don't know about the substance. the issue really is that for every patient who would benefit from medical marijuana, there are probably several o

reporter: medical marijuana is used by those terminally ill, those suffering from cancer, even montel williams who has multiple sclerosis. washington, d.c. recently opened its first clinic. >> marijuana is not a dangerous adrug. it's not addictive and it does have medical applications. >> reporter: the doctor is working on a new documentary called weed. he says he's traveled the world and has talked with some of the foremost experts doing research in medical marijuana. >> our law goes into effect in october. the state is still trying to determine how marijuana will be dispensed. >>> three winners will split the power ball jackpot worth half a billion dollars. paul white is taking the lump sum payment. after taxes, he'll pocket a little over $58 million. the other two winners have not yet come forward. both tickets were sold in new jersey. >>> great celebration at the national zoo in washington, d.c. after the birth of a pair of critically endangered tiger cubs. the zoo says they appear to be healthy and the first-time new tiger mother has been seen grooming and nursing them. there are just abo

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