Is cannabis an effective treatment for joint pain?

Cannabis has been used to treat pain for thousands of years. However, since the early part of the 20th century, laws restricting cannabis use have limited its evaluation using modern scientific criteria. Over the last decade, the situation has started to change because of the increased availability of cannabis in the United States and many other countries for either medical or recreational purposes. The preclinical and human data that do exist indicate that the use of cannabis should be taken seriously as a potential treatment of joint pain.