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A smoking device intended for therapeutic uses, such as medical marijuana or herbal remedies, providing for cooling of smoke due to latency in multiple chambers, filtration of condensed tars from cooled smoke, and decreased respiratory strain for the user provided by a annular carburetor valve, whic

A smoking device intended for therapeutic uses, such as medical marijuana or herbal remedies, providing for cooling of smoke due to latency in multiple chambers, filtration of condensed tars from cooled smoke, and decreased respiratory strain for the user provided by a annular carburetor valve, which propels the cooled and filtered smoke into the user's airstream by means of pressure equalization. In a preferred embodiment, the device is constructed so as to be extremely durable, shielding the glass smoking bowl from impact and shock, and is manufactured of non-toxic materials appropriate to a device for therapeutic use. A venturi effect chasing of entrapped smoke projects the smoke quickly into the lungs. The taste of different herbs such as tobacco, cannabis indica, cannabis sativa and different strains of each is accentuated.

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1. A pipe comprising: an elongate chamber having an inhalation port at a proximal end suited to fit over a user's mouth;a smoke expansion chamber extending away from the inhalation port;a purge carburetor extending from a distal end of the elongate chamber;said purge carburetor having an extendable

1. A pipe comprising: an elongate chamber having an inhalation port at a proximal end suited to fit over a user's mouth;a smoke expansion chamber extending away from the inhalation port;a purge carburetor extending from a distal end of the elongate chamber;said purge carburetor having an extendable valve head that seals an annular inlet in a passive mode and opens the annular inlet in an inhalation mode;a smoke injection shaft affixed to the extendable valve head;said annular inlet further comprising a plurality of elongate bores arranged in a circular pattern around the smoke injection shaft,said extendable valve head having a burn bowl feeding into the smoke injection shaft that protrudes into the smoke expansion chamber;wherein burning a material in the burn bowl while the user provides inhalation pressure over the inhalation port in the passive mode injects smoke from the burn bowl through the smoke injection shaft and into the smoke expansion chamber;wherein extending the extendable valve head along with the smoke injection shaft, for the inhalation mode opens the annular inlet allowing ambient air to rush into the smoke expansion chamber and force the smoke into the user's mouth; andwherein a spring biases the extendable valve head back to the passive mode. 2. The pipe of claim 1, wherein the elongate chamber has a cylindrical shape and is made of a transparent material. 3. The pipe of claim 2, wherein the purge carburetor comprises an assembly including the smoke injection shaft, an annular mounting collar around the smoke injection shaft which removably engages the distal end of the elongate chamber, and a spring loaded extendable valve head. 4. The pipe of claim 3, wherein the burn bowl further comprises a glass bowl having a stem removably insertable into the extendable valve head and shock mounted inside the valve head. 5. The pipe of claim 4, wherein the purge carburetor further comprises an annular shape having an annular bushing around the annular mounting collar to engage an interior annular wall of the elongate chamber. 6. The pipe of claim 5, wherein the smoke injection shaft further comprises a removable nozzle having a screen filter therein. 7. A pipe comprising: an elongate chamber having an inhalation port at a proximal end suited to fit over a user's mouth;a smoke expansion chamber extending away from the inhalation port;a purge carburetor extending from a distal end of the elongate chamber;said purge carburetor having an extendable valve head that seals an annular inlet in a passive mode and opens the annular inlet in an inhalation mode;said extendable valve head having a burn bowl feeding into a smoke injection shaft that protrudes into the smoke expansion chamber;wherein burning a material in the burn bowl while the user provides inhalation pressure over the inhalation port in the passive mode injects smoke from the burn bowl through the smoke injection shaft and into the smoke expansion chamber;wherein extending the extendable valve head for the inhalation mode opens the annular inlet allowing ambient air to rush into the smoke expansion chamber and force the smoke into the user's mouth;wherein the elongate chamber has a cylindrical shape and is made of a transparent material;wherein the purge carburetor comprises an assembly including the smoke injection shaft, an annular mounting collar around the smoke injection shaft which removably engages the distal end of the elongate chamber, and a spring loaded extendable valve head; andwherein the spring loaded extendable valve head further comprises a bushing on the smoke injection shaft that secures a cylindrical spring around the smoke injection shaft. 8. A pipe comprising: an elongate chamber having an inhalation port for a user's mouth;a smoke expansion chamber attached to the inhalation port;a purge carburetor extending from an orifice of the elongate chamber;said purge carburetor having a plurality of bores arranged in a circular pattern around a smoke injection shaft;said purge carburetor having an extendable valve head that seals the bores which are in fluid communication with the smoke expansion chamber in a passive mode and opens the bores to outside air in an inhalation mode;said extendable valve head having a burn bowl feeding into the smoke expansion chamber;wherein burning a material in the burn bowl while the user provides inhalation pressure over the inhalation port in the passive mode injects smoke from the burn bowl into the smoke expansion chamber;wherein extending the extendable valve head for the inhalation mode opens the inlet allowing ambient air to rush into the smoke expansion chamber and force the smoke into the user's mouth; andwherein the purge carburetor comprises an assembly including a smoke injection shaft in fluid communication with the burn bowl, a mounting collar around the smoke injection shaft which engages the inlet to the smoke expansion chamber, and a spring loaded extendable valve head which biases the purge carburetor closed in a passive mode. 9. The pipe of claim 8, wherein the elongate chamber has a cylindrical shape and is made of a transparent material. 10. The pipe of claim 9, wherein the burn bowl further comprises a stem removably insertable into the extendable valve head. 11. The pipe of claim 9, wherein the inlet to the smoke expansion chamber further comprises a plurality of bore holes. 12. The pipe of claim 9, wherein the smoke injection shaft further comprises a filter. 13. A pipe comprising: an elongate chamber having an inhalation port for a user's mouth;a smoke expansion chamber attached to the inhalation port;a purge carburetor spring loaded to open and close an orifice of the elongate chamber; said purge carburetor having an extendable valve head that seals a plurality of bores arranged in a circular pattern around a smoke injection shaft, said plurality of bores forming an inlet to the smoke expansion chamber in a passive mode and opens the inlet in an inhalation mode;said valve head having a burn bowl feeding into the smoke expansion chamber;wherein burning a material in the burn bowl while the user provides inhalation pressure over the inhalation port in the passive mode injects smoke from the burn bowl into the smoke expansion chamber; andwherein opening the valve head for the inhalation mode opens the inlet allowing ambient air to rush into the smoke expansion chamber in parallel columns of air and forces the smoke into the user's mouth. 14. The pipe of claim 13, wherein the elongate chamber has a cylindrical shape and is made of a transparent material. 15. The pipe of claim 14, wherein the purge carburetor comprises an assembly including a smoke injection shaft in fluid communication with the burn bowl, and a mounting collar around the smoke injection shaft which engages the inlet to the smoke expansion chamber. 16. The pipe of claim 15, wherein the inlet is located at a distal end of a cylindrical smoke expansion chamber.