How in depth is Cannabis studied?

To date, there are over 20,000 published studies or reviews in scientific literature pertaining to the Cannabis plant and its cannabinoids, nearly one-third of which were published within the last three years. This total includes over 2,700 separate papers published in 2009, 1,950 papers published in 2010, and another 2,100 published to date in 2011. While much of the interest in cannabinoid therapeutics is a result of the discovery of the endocannabinoid regulatory system, some of this increased attention is also due to the growing body of testimonials from medical Cannabis patients and their physicians.