Here's a link about MMJ patients being denied transplants: Beverly Hills NORML Director Cheryl Shuman testifies on the cruelty of banning medical marijuana patients from transplant lists | NORML Blog, Marijuana Law Reform

I've read many others recently, but I just woke up and don't have the mental power to find more example just yet

There are definitely some "cons" or drawbacks to medical marijuana use, as with any other medicine. You have to decide if the benefits outweigh the drawbacks, I guess.