grit weed
Cannabis (marijuana) laced with silica glass. It causes the buds to be heavier and creates a lethal product. Found in the UK, examine your buds and rub them on glass and if it scrapes than it is tainted. Throw it away, it can be lethal.
John smoked some grit weed, he lost his voice and kept coughing up blood, had to take him to the hospital.