Marijuana Users May Need More Anesthesia During Surgery, Study Says

A study led by an anesthesiology resident at the University of Colorado Hospital found that people who smoke marijuana before surgery require more anesthesia and opioids during and after surgery. This is likely due to the development of a higher tolerance in marijuana users, necessitating increased painkiller dosages to achieve the desired effects.

What do researchers think might be the reason for increased tolerance in marijuana users?

In what ways might marijuana use complicate recovery after surgery?