Marijuana, cannabis (haschish, hash, bang, dab)
Some adverse effects of marijuana may overlap with those of tobacco smoke. Not all studies confirmed whether marijuana per se is harmful to the airways (PMID 29629404). Variation in cannabis/marijuana/haschich potency, concentration (e.g. resin, hash oil), contamination with fungi (PMID 6348548) and possible adulteration should be considered (PMID:18494838). Reviews at PMID 24831571, 24897085, 25996274, 26935046, 29629404, 29971337. Some users vaporize cannabis using electronic cigarette devices (PMID 30835796)