Second-hand smoke is harmful, but the relationship is mediated by several factors, including the amount of smoke, frequency of use, ventilation and more. Little is factually known about the effects of cannabis smoke on lung health. However, cannabis smoke irritates the throat and lungs, and contains chemicals and tar that are similar to tobacco smoke, which can raise risks for cancer, and lung disease.
Is cannabis addictive?
What should I do if I’ve consumed too much cannabis?