Myrcene is one of the major cannabinoids found in cannabis. It's very useful and has many health benefits of its own which contribute to the medicinal propreties of specific strains especially those that contain high amounts of this terpene.
Via google Myrcene
Myrcene is present not only in cannabis plants, but in hemp as well. It actually got is name from a medicinal plant in Brazil known as the Myrcia Sphaerocarpa, which has been used as a folk remedy for the treatment of conditions like dysentery, diabetes, diarrhea and even hypertension.
Via google Myrcia Sphaerocarpa
In 97, Switzerland have made a study that was investigating some various cannabis strains and they found 16 terpenes. Researchers at the time found that Myrcene is the most abundant of all the terpenes, and in some starins the overall Myrcene content is even more than half of the total terpenes.
10 years after, a study demonstrate that Myrcene may be a cure for diabetes. Believe it or not, it plays a big role on the effects (indica or sativa) it may occur in the plant.
Now a bit further in time, 2011, a British Journal of Pharmacology came to the conclusion that when consume in a high doses, Myrcene can act like a effective sleep aid when they are mixed with other terpenes.
Myrcenes can act like a painkiller. In 91, a study showed that Myrcene can act like an aspirin and can be used through different channels in the body. Mango Kush and Blackberry Kush both have high amount of Myrcene for example.