Medical Cannabis refers to the use of the drug cannabis as a physician-recommended herbal therapy, most notably as an antiemetic.
Due to widespread illegal use of cannabis as a recreational drug and several other reasons, its legal or licensed use in medicine is a controversial issue.
Regardless of the benefits of medical cannabis, the widely perceived health risks of smoking as a route of administration have been viewed as a major obstacle for the legal approval of cannabis for medical uses, though some studies indicate that the expectorant activity of THC may help the lungs remove much of the inhaled tar through coughing.
In response to the concerns, several studies have aimed to establish whether or not vaporizers could offer a clinically reliable and safe route of administration for cannabis.
A vaporizer is a device commonly used to release medicinal and/or psychoactive compounds from plant material, probably the most commonly used herb is cannabis, although it can also be used for tobacco or to release certain therapeutic compounds from herbs and other plants, a practice now commonly known as Phyto-Inhalation. For medical or recreational cannabis users, vaporizing is an alternative to smoking. Rather than burning the cannabis, a vaporizer heats it enough (typically around 200 degrees Celsius) so that the volatile psychoactive and medicinal constituents contained in the plant's oily glandular secretions melt and phase into an aromatic vapor that does not contain the particulate matter such as tars and other toxins found in the smoke.
This is the non-smoked method most often recommended as an alternative to smoking. Patients can utilize it for most of the symptoms/conditions for which marijuana is recommended.
Marijuana - A smoking gun