“Marijuana is legalized for either medical or recreational use in over half of the United States and in Canada, but many transplant centers will not list patients who are using marijuana. However, the effect of marijuana on transplant outcomes remains unclear. Thus, we performed a retrospective analysis of all adult (≥18 years old) liver transplant patients treated at our center between 2007 and 2017. After adjustment, current tobacco users were over three times as likely to die within 5 years, compared to never users, but no difference was seen between current/former and never marijuana users. No significant differences in inpatient respiratory complications, reintubation, or >24 hours intubation was seen. Overall, pre-transplant marijuana use, past or current, does not appear to impact liver transplant outcomes; however, tobacco smoking remains detrimental.”

https://www.ncbi.nlm.nih.gov/pubmed/30693668

https://aasldpubs.onlinelibrary.wiley.com/doi/abs/10.1002/lt.25417