OMG this is too funny! I do know from personal experience that it is possible to have a "bad trip" from eating marijuana. The problem seems to be that there is no way to control your high. When you smoke marijuana, you can pretty much stop where you want to be, and unless it is "creeping" marijuana, you will stay right where you are. Eating laced baked goods, on the other hand, is a crap shoot. You don't know until too late if you are more stoned than feels alright.
This happened to me once back in the day. (I am not going to say one way or the other whether I smoke or do not smoke now. However, I came of age in the hippie days of the late 60s and early 70s, and if anyone in my age range tells you they never smoked what we called "pot", they are either lying or they are serious geeks.) Anyway, my husband at the time had planted some in the backyard. Come the harvest, we were sad to discover that smoking our crop was pretty much like smoking cabbage. No way could you get high.
Just so it wouldn't be a total waste, I decided to throw a handful or two into some chocolate chip cookie batter that was ready to go in the oven. About an hour later, out of nowhere I was hit with the highest high I have ever had, and believe me, it did not feel good at all. I couldn't walk straight, think straight, see straight. I had the only anxiety attack I have ever had while stoned. It was nothing at all like the mellow high from smoking.
Anyway, on the serious side, I just did about half an hour of research and found out that, based on the limited number of studies I read, opinion is pretty equally divided in the medical community as to whether marijana helps or hurts depression and anxiety. The only mention of PTSD that I came across showed positive results. As far as anecdotal evidence (personal stories), opinion is also divided. Some people feel incredibly better, some people feel incredibly worse.
This is pretty much what happens with traditional anti- anxiety and depression medications. What one person hails as a breakthrough, another person might find a disaster.
Okay, Grandpa wants to know why I was falling out of my chair laughing, so I'm going to show him the videos.