Before putting smoking material in the tip of the stem, grind it so that air can percolate through it. A good way to grind it is by "straining" it through a corse kitchen strainer -- one having wires spaced about 10 per inch (about 3 per centimeter, prepare extra material in advance and store in an air tight container). It is important that the smoking blend or tobacco be in small particles so that the heated air can filter through it with minimal obstruction to flow. Good air flow through the tobacco is important to getting high efficiency heat transfer and vaporization.
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