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A blood clot forms in the leg called a deep vein thrombosis (DVT)

The design illustrated in Figure 10 in which an annular region of filter fibres containing carbon additive (9b) is situated at the tobacco end of the filter (le), offers advantages in that the smoke stream may pass through a region of carbon additive which has a high surface area relative to the smoke stream (offering the benefits described above relating to the adsorption of smoke constituents)

The resulting oil or concentrate can then be mixed with other ingredients, such as terpenes or flavorings, to enhance the flavor and aroma of the oil

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Some users prefer to take one or two puffs every thirty minutes, while others like to have a longer "session" that mimics their old smoking breaks