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The distinction between 99406 (3-10 minutes) and 99407 (greater than 10 minutes) is based solely on time
PipesMagazine.com member cgrd took some neat pictures of the crystals on a flake of Stonehaven from under a microscope which you can see here
The Mixture is composed of black-brown short and narrow-cut fibers and medium brown Ready Rubbed shares
Compared to cigarettes and other nicotine alternatives, heated tobacco products have lower levels of exposure to harmful chemicals

Key clinical features commonly observed in cannabis dependence include: Strong craving or urge to use cannabis even when use is inappropriate Unsuccessful efforts to cut down or control use, often with repeated relapse Increasing priority on cannabis, with a reduction in participation in social, recreational, or occupational activities Time spent obtaining, using, or recovering from cannabis use at the expense of other responsibilities Continued use despite awareness of persistent or recurrent physical or psychological problems likely caused or exacerbated by cannabis Tolerance, where increased amounts are needed to achieve the desired effect Note: Tolerance may be present, but is not required for the uncomplicated specifier Although withdrawal, a physiological syndrome following cessation, can occur with cannabis, F12.20 is designated for cases without documented withdrawal