Research into medicinal marijuana is undergoing a surge of interest, with more evidence emerging not only of its ability to ease human suffering, but also of its apparent safety. Some say cannabis may be less toxic to humans than over-the-counter pain relievers. Scientifically controlled experiments have concluded that smoked cannabis can provide moderate relief from chronic, severe non-cancer pain — including HIV-related nerve pain and post-traumatic neuropathy, a condition that can follow an injury or medical procedure. Both are notoriously resistant to conventional treatments. (See also: Ten Years of Medical Marijuana in Canada)