marijuana. >> how much does it concern you that there isn't science behind this and it hasn't been studied in this country? >> if he isn't doing this the fear is he wouldn't be here. if there are side effects down the road that haven't been studied yet, we'll take that when it comes. for now the children and i have my husband and father with us. >> dr. sanjay gupta joins me now from atlanta. hi sanjay. should this veteran be concerned there are no studies that show that marijuana is effective in dealing with depression and suicidal thoughts? >> part of the reason we showed that and introduced you to that veteran is because that's the state of affairs right now. people are given all these medications. many of them don't work. he was suicidal overdosed on the mainstream medications and turned to this as a last resort. the position he's in is it's trial and error for him. he has to try different things and figure out what's going to work and what doses are. we know more about the fact that