Grass is the preparation of Cannabis in which the plant matter is processed and converted into a finer substance than one would find in any bag of kind bud, nugs, or weed.

Grass has many advantages and disadvantages in comparison to other Cannabis preparations. Since it is denser, it burns easier and stays lit for longer. However, many pipes and bowls are not efficient for smoking grass because the fine particles can fall through the screen, resulting in Scooby Snacks. A second disadvantage to grass is that it is harder for the consumer to determine the purity of it, other than by its colour and smell. It would be hard to detect if the quality product has been contaminated, or laced.