Medically, marijuana is often used to aid the treatment of some advanced and terminal diseases (cancer, AIDS). It is used to increase appetite and relieve pain.Although medical marijuana is politically controversial, doctors often informally recommend it to patients.THC (known as Dronabinol or Marinol), a synthetic active ingredient in marijuana, is openly prescribed in many countries.THC also has the effect of reducing artery blockages.Sativex, an under-tongue spray made from cannabis extract, has been approved in Canada to treat multiple sclerosis and is legally imported into Britain and Spain as a prescription drug.

On April 13, 2015, the medicinal value of marijuana was admitted: killing cancer cells improves the effect of radiotherapy.

Economically, hemp stem and skin fibers are long and tough, which can be used to weave linen or yarn, make ropes, weave fishing nets and make paper.Seed oil, 30% oil content, can be used for paint, paint, etc., oil residue can be used as feed.

At the 248th national meeting of the American chemical society (ACS) in the United States on August 12, 2014, Dr. David Mitlin and his team at clarkson university in New York developed their supercapacitor using carbon extracted from marijuana as an electrode and an ionic liquid as an electrolyte.When assembled, the hemp battery device performs better than any other supercapacitor on the market, both in terms of energy density and working temperature range.Hemp battery devices can produce energy densities of up to 12 watt-hours per kilogram, which is two to three times higher than other battery devices on the market.Also, marijuana battery devices operate in a wide range of temperatures, ranging from freezing to 200 degrees Fahrenheit.