A vaporizer or Vapo is a device or system used to extract and deliver for inhalation the active ingredients of plant material, commonly cannabis, tobacco, or any of many other herbs or blends of spices. (phyto-inhalation; see also: aromatherapy). Vaporization is an alternative to smoking. Rather than burning the herb, which produces toxic, irritating, and carcinogenic by-products, a vaporizer heats the material so its active compounds boil off into a vapor. No combustion occurs at all, so no smoke or taste of smoke is present. The vapor ideally contains virtually zero particulate matter or tar, and significantly lower concentrations of noxious gases such as carbon monoxide. The vapor is extracted in various forms of extraction chambers including straight bore, venturi or sequential venturi, made out of material such as metal or glass. The extracted vapor is collected in a jar or inflatable bag, or inhaled directly through a hose or pipe. With little to no smoke produced, cooler temperatures, and less material required to achieve a given level of effect, the irritating and harmful effects of smoking are greatly reduced or eliminated, as is secondhand smoke. In comparison to other drug delivery methods such as ingestion, vaporization offers the advantages of rapid onset of pharmacological effect, direct delivery into the bloodstream (via the lungs), and more precise titration such that the desired level is reached and not exceeded, enabling consistent and appropriate dosage..

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