The thing about Marijuana, is that it has been ruled as safe, aside from that, nothing is good or bad, everything that's good can be bad and everything that's bad can be good. A gun is good when used for self defense, bad when used for rape, 50grams of vitamin C are good in some cases, no diarrhea and increased healing, bad in some cases, causing diarrhea and messing up your day, same thing with Marijuana, it's not good and it's not bad, if you use it and the positives outweigh the negatives, then it's good, for you, if the negatives outweigh the positive, then it's bad for you.
Like any tool in this universe, it can't be good or bad, a tool has no ability to be good or bad, it depends on how it's used and what for, what circumstances, etc....
Attention: This is your common sense, we are now trying something new, please decide if it's good or bad for you. This experience time will vary, please be safe at all times, learn all you can from it and make a decision, experience and effectiveness may vary, remember to enter without prejudice and have a nice experience.
It's a shame that fear and lack of initiative rule today's people.