Clinical data published in the Journal of Pain suggest those who suffer from chronic pain can use cannabis daily to reduce discomfort and increase their quality of life without experiencing serious side effects.
The study, which took place for a year at McGill University in Montreal, examined the long-term health of 216 patients who suffered from non-cancer related chronic pain and consumed medical cannabis daily using a standardized dose of 12.5 percent THC. The study also included 215 control subjects who did not consume cannabis. The participants who consumed cannabis typically inhaled or vaporized 2.5 grams of the plant.
The Daily Chronic analyzes this study, noting "Investigators reported that daily cannabis consumers possessed no greater risk than non-users to experience 'serious adverse events.' Specifically, researchers identified no significant adverse changes in consumers' cognitive skills, pulmonary function, or blood work following one-year of daily cannabis consumption." The fact that participants did not experiences serious health effects attests to cannabis' safe reputation. Authors of the study concluded, "Quality-controlled herbal cannabis, when used by cannabis-experienced patients as part of a monitored treatment program over one year, appears to have a reasonable safety profile." While consumers didn't experience serious events, they did experience minor side effects like dizziness, coughing, or paranoia.
This study is significant because it is one of the first to examine long-term safety and efficacy of medical marijuana. For more information, you can read the Daily Chronic's full analysis or look over the study directly.