Old School OG is an indica weed strain made from a genetic cross between Pure Kush and OG Kush and has an unknown breeder. Old School OG is 25% THC, making this strain an ideal choice for experienced cannabis consumers. Leafly customers tell us Old School OG effects make them feel relaxed, tingly, and sleepy. Medical marijuana patients often choose Old School OG when dealing with symptoms associated with stress, anxiety, and depression. The dominant terpene of this cannabis strain is terpinolene. Old School OG features a pungent and earthy aroma and flavor profile of skunk.