Two years ago, little Cash Hyde was diagnosed with stage 4 brain cancer.
He endured bouts of chemotherapy that made him sick. He didn't eat for 40 days, and was vomiting severely.
As his parents watched helplessly, they made a crucial decision.
Kalli and Mike Hyde asked doctors to take Cash off his anti-nausea and pain medications and secretly gave him cannabis oil, made from marijuana.
What they did was illegal; however, 3-year-old Cash is in remission and doing well.
HLN's Dr. Drew and his guests debate whether it really was the cannabis oil that's made Cash feel the way he does today.