I live in a house where one of my roommates is constantly smoking marijuana, lately I have been having issues with shortness of breath, tightness in my chest, a cough that will not go away. I personally do not smoke tobacco or marijuana. I have gotten a bunch of tests done by my gp with nothing showing up. I am very concerned about this as I seem to be getting worse, there has been small traces of blood in what i am coughing up.