Is smoking weed with asthma a bad thing?

Yes: Marijuana smoking has been associated worsening respiratory symptoms including coughing, phlegm production and wheezing. It can also act as an allergen in some patients. Smoking both tobacco and marijuana synergistically increases the risk of developing chonic obstructive pulmonary disease (copd). Also, marijuana smoke contains ~ 3 times the amount of tar found in tobacco ; 50% more carcinogens.