I'm fairly certain it is not known for sure that Juul isn't killing people. It actually seems to come up often in terms of nocotine products people who get sick are using. That could be just due being a popular brand, but the company is obviously very shady and I wouldn't be surprised if they turn out to be part of the problem. Current regulations seem to be very minimal and not sufficient to establish safety. At first I thought it was overreaction, but I can see why the CDC is saying maybe don't vape for now, especially if you start to have any lung issues (which seems to be about what you are saying except for the last part about Juul being safe).