Trimming is not the only time that cannabis buds will shed shake. Dispensaries store cannabis in acrylic or glass jars.  If the dispensary has a wide assortment of flowers, those jars might be moving around all day.  As the buds move, more shake is created at the bottom of the jar. Dispensaries learned two things very quickly. First, that they never want to waste good cannabis.  And second, that a large number of people love pre-rolls.  But can’t seem to roll a joint with any degree of skill.  So, they began reducing, reusing, and weed-cycling naturally occurring shake into convenient pre-roll products for patients.