Survey: Half of the people with uncontrolled asthma smoke cannabis As the number of states increase where medical and recreational cannabis use is legal, so does the importance that physicians discuss with patients the effects of cannabis on those with asthma. A new survey in Annals of Allergy, Asthma and Immunology, the scientific journal of the American College of Allergy, Asthma and Immunology, shows that of those who used cannabis, about half smoked it while a third vaped – both "inhalation routes" likely to affect one's lungs. It surprised me that over half of the cannabis users in this study who have asthma were smoking it. And further, of those with uncontrolled asthma, half reported smoking cannabis. We also found that people with asthma are not routinely being asked or advised by their physician about cannabis and how they are consuming it."