It's better for your lungs than tobacco.

According to a study published in Journal of the American Medical Association in January, marijuana does not impair lung function and can even increase lung capacity. Researchers looking for risk factors of heart disease tested the lung function of 5115 young adults over the course of 20 years. Tobacco smokers lost lung function over time, but pot users actually showed an increase in lung capacity. The increased lung capacity may due to taking a deep breaths while inhaling the drug. It controls epileptic seizures! Robert J. DeLorenzo of Virginia Commonwealth University, gave marijuana extract and synthetic marijuana to epileptic rats. The drugs rid the rats of the seizures for about 10 hours. Cannabinoids like the active ingredient in marijuana, tetrahydrocannabinol (also known as THC), control seizures by binding to the brain cells responsible for controlling excitability and regulating relaxation