Crack is extremely damaging to the lungs. The most common complications from smoking crack are breathing complications, chronic bronchitis, chronic coughing, and coughing up black phlegm. These complications can cause shortness of breath and chest pains. Holding the smoke inhaled from smoking crack in for long periods of time can cause your lungs to collapse. In rare cases, the lungs can fill with fluid causing sever shortness of breath, respiratory failure or even death.