This document discusses the health risks of smoking marijuana. It warns that marijuana smoke contains carcinogens like benzapyrene, which can lead to respiratory problems and cancer, similar to tobacco smoke. The document notes that the American Medical Association and studies from the Institute of Medicine and Molecular Medicine have found marijuana smoking to be a public health concern and have shown marijuana smoke to contain carcinogenic compounds in both its gas and particle phases that can damage lung tissue and promote cancer, especially the carcinogen benzapyrene which attacks the alveoli in the lungs.