Medical Marijuana has been legalized in Washington D. C. and 23 other states. National Institute on Drug Abuse has also listed cannabis as a useful drug for medical purposes.

Although the Drug Enforcement Agency has categorized marijuana as a schedule I drug. The schedule I classification means that it's tough for researchers to get their hands on pot grown to the exacting standards that are required for medical research, even in states where it's legal.

Also, no researcher can even try to make an FDA-approved cannabis product while it has that DEA classification.

A majority of Americans also believe that the medical pot should be legal since the late 1990s and many are currently supporting the recreational legalization of the drug.

Researchers have identified some potential benefits of medical marijuana so far. However, they believe that the drug is still hard to study and thus the thus it becomes difficult to make conclusive results.

A further research into the drug would help to identify its health benefits more clearly. At the same time, it would also help clarify potential dangers such as risks associated with abuse, which include dependency and emotional issues.

Marijuana has 21 medical potential benefits. It can be used to treat and prevent the eye disease glaucoma, which increases pressure in the eyeball, damages the optic nerve and causes loss of vision.

According to National Eye Institute, it decreases the pressure inside the eye. It institute said, "Studies in the early 1970s showed that marijuana, when smoked, lowered intraocular pressure (IOP) in people with normal pressure and those with glaucoma".

There is a fair evidence that marijuana doesn't harm lungs, unless you it is smoked with tobacco. For most states that have legalized marijuana, April 20 is celebrated as the stoner's day.