Most vaporizer deliver dry, warm vapor that can irritate the throat and upper tracheo bronchial tree. It must be remembered that at least in terms of Cannabis, heat is the primary culprit leading to damage of the tracheo-bronchial tree whether smoking or vaporizing. Cannabis smoke contains tars and noxious gases known to be harmful not present in accurately extracted vapor.....

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.[9] In response to the concerns......

A vaporizer (or vapouriser) is a device used to sublimate the active ingredients of plant material, commonly cannabis, tobacco, or any of many other therapeutic or medicinal herbs or blends (phyto-inhalation; see also: aromatherapy). Vaporization is an alternative to smoking. Rather than burning the herb, which produces irritating, toxic, and carcinogenic by-products.....

The vapor is then inhaled directly through a hose or pipe for highest activity, or stored for subsequent inhalations in a container such as a bag or jar. With little to no smoke produced, cooler temperatures, and less material required to achieve a given level of effect, the irritating/harmful effects of smoking are greatly reduced or eliminated.....

Few vaporizer studies/reviews have really addressed the quality of the vapor extracted and delivered. Most studies/reviews have tended to focus on the mode of usage of the vaporizers and not the quality of the vapor extracted and delivered. When one considers that there are at least 60 pharmacologically-active compounds in cannabis ....

In a 2001 study testing a device called the M1 Volatizer,[12] the researchers found that "it is possible to vaporize medically active THC by heating marijuana to a temperature short of the point of combustion, thereby eliminating or substantially reducing harmful smoke toxins that are normally present in marijuana smoke." The M1 Volatizer, produced THC at ....