J1, also known as "Jack One," "Jack 1," and "J-1," is a high-end hybrid marijuana strain that is gaining widespread popularity. J1 is a cross between two famous sativas, Skunk #1 and Jack Herer, and is best known for its strong, uplifting, clear-headed buzz that allows for extra mobility. The flowers are emerald green and frosty with a sweet aroma resembling the unmistakable Jack Herer pungency.