Researchers note that doses of cannabis (marijuana) have been shown to reduce the muscle spasms experienced by many people who have multiple sclerosis. The use of medical marijuana continues to be a struggle in the United States. Although it has been shown to be very effective in treating various diseases and illnesses, including chronic pain, nausea, glaucoma, seizure disorders, PTSD, cancer, diabetes, and others, many people risk arrest when they use marijuana for medicinal purposes. In October 2009, President Obama stated that his administration will not seek to arrest medical marijuana users and suppliers if they conform to state laws. Although research indicates that cannabinoids offer benefits for multiple sclerosis patients because they can reduce inflammation and they have quelled spasms in animal studies, some officials, including regulators and researchers, have been concerned about the intoxicating side effects of THC. The authors of the recent paper, however, note that the combination of THC and CBD can limit psychotropic effects. They also note that the multiple sclerosis patients in the studies they evaluated generally well tolerated the side effects of the combined marijuana extracts.