Uh no. It’s BS.

Marijuana doesn’t contain the chemical male reproductive organtail that cigarettes do, but it’s not good for your lungs. Coughing up mucus all the time is not a good sign no matter what. And it should be noted that the reason smoking pot isn’t considered as damaging is because you just don’t smoke as much. If you smoked the same amount as cigarettes, you’d get the same or worse damage (since it’s unfiltered and inhaled more deeply).