Barbecue grill and smoker

A grill, comprising:

• a. a lower grill chamber;
• b. an upper grill chamber hinged to the lower grill chamber at a rear edge of the lower grill chamber, wherein the upper grill chamber is configured to close over the lower grill chamber to form an interior cooking chamber;
• c. at least one volcano in the lower grill chamber, the at least one volcano comprising an opening;
• and
• d. a rigid vent tube rotatably mounted beneath the at least one volcano wherein the vent tube comprises at least one vent tube exit hole positioned at a first point on a side wall of the vent tube facing radially from a longitudinal axis of the vent tube, and a vent tube entry hole positioned through an end of the vent tube coaxially with the longitudinal axis of the vent tube, wherein air is configured to flow from outside the cooking chamber into to the vent tube through the vent tube entry hole, further wherein the vent tube is rotatable to a first position such that the volcano and vent tube exit hole are at least partially aligned to allow air passage from the vent tube into the interior cooking chamber through the vent tube exit hole, and to a second position such that a solid wall positioned at a second point on the side wall of the vent tube is aligned with the volcano to thereby fully block air passage into the interior cooking chamber through the vent tube exit hole.