( CNN ) In case you have n't noticed , we 're in the midst of a medical marijuana revolution . Given the amount of questions and mystery surrounding the science behind it , Dr. Sanjay Gupta wanted to provide some insight . He 's been investigating medical marijuana for the last couple of years . His research has resulted in three CNN documentaries , culminating with `` Weed 3 : The Marijuana Revolution , '' airing at 9 p.m. ET/PT Sunday . Gupta opened up to questions on Twitter . Here 's what you wanted to know : . How does this affect me ? Readers were curious about the effects of medical marijuana in easing symptoms of various ailments , asking how it could help with everything from life-threatening illnesses and neurological conditions to chronic pain and post-traumatic stress disorder . Gupta pointed out the 10 diseases where medical marijuana research could have an impact and how it helped to stop one young girl 's severe seizures , and he also referenced other studies . He said that the potential benefits of medical marijuana for people suffering from PTSD is actually the subject of a federally approved study . The belief : It could suppress dream recall and allow those sufferers to focus on the present . There is also research into how the drug might affect the spasms associated with people who have multiple sclerosis . Medical marijuana could also be an important option for those who rely on painkillers , as painkiller overdose is the greatest preventable death in the United States , Gupta said . Why do n't other doctors talk about it ? Many of the questions around medical marijuana can be tied back to the fact that it 's just not discussed much . Teaching about medical marijuana remains taboo in medical school . But Gupta also presented the science directly , showing what your body on weed looks like . Readers also wanted to know why people are so against the legalization of marijuana . Decades of misinformation , Gupta said . What are the drawbacks ? With medical marijuana so misunderstood , there naturally is a fear of potential side effects . There are legitimate , long-term concerns with the developing brain , Gupta said , and suggested that readers seek out the research of Dr. Staci Gruber , who has conducted numerous studies on marijuana use and brain function . Is n't it dangerous ? When confronted with questions rooted in fear about the dangers of medical marijuana , Gupta confessed that he used to believe the same thing -- that marijuana is dangerous without proven benefits . After extensive research , he said he changed his mind on weed .
marijuana 's Dr. Sanjay Gupta answers questions about medical marijuana . Readers wanted to know how medical marijuana could ease symptoms of illnesses .