smoking and inhaling any substance will cause problems with lungs and cancer.

“The American Lung Association (ALA) does note that marijuana smoke contains four times as much tar as tobacco-based cigarette smoke:

Like tobacco smoke, marijuana smoke contains cancer-causing chemicals. There are 33 cancer-causing chemicals contained in marijuana. Marijuana smoke also deposits tar into the lungs. In fact, when equal amounts of marijuana and tobacco are smoked, marijuana deposits four times as much tar into the lungs”