If you want to get high quickly, finely ground marijuana in that joint is the way to go — science proves it! writes Rachel Berkowitz for Scientific American. In fact, research shows that particle size is even more important to a joint’s intoxicating effects than the herb’s concentration of cannabinoids. Berkowitz explains how the research was done (lab machinery did the smoking, fortunately, not a human) and why it is important for the burgeoning legal-marijuana industry to understand factors like this that affect standardization and potency of their products. Photo: Elsa Olofsson via Wikimedia Commons