Experts Want More Data on Effects of Medical Marijuana Even though Maryland is following the lead of 23 other states in setting up a medical marijuana industry, the collective experience of those states has translated to relatively little understanding of how the dozens of active substances within the plant affect health. As a result, Maryland will launch what likely will become a multimillion-dollar industry to make a psychoactive drug more available statewide without the benefit of proven information about the health implications. [continues 1288 words]