Gorilla Glue #4 is a very potent strain of cannabis, mainly grown in Colorado. The genetic makeup is a mix of Chocolate Diesel with Sour Dub and Chem Sister. The smell of diesel is strong but the taste is similar to coffee that has gone stale. The smell is extremely strong, one of the strongest strains. This is why it is mainly grown indoors. The THC level is about 25-28%. This marijuana plant is light green in color.