Can Smoking Weed Cause Cancer? People should have a big question about this especially since smoking surely has kind of serious issue with cancer. The lung cancer cannot be separated from the smoking habit especially the tobacco smoking. Some people think that smoking with other ingredients can be safer than tobacco smoking. Is that true? People should feel relieved yet before they read further information about weed smoking such as marijuana smoking. Maybe they will think twice about any kind of smoking type once they are well informed about the bad effect which can be caused to their health. The weed which we are talking about is marijuana especially.