You can get stoned off the leaves, even from a male plant and I know this for a fact because I smoked some last night. The smoke was surprisingly OK but the high was nowhere near what you get from buds and doesn't last as long; still gets you high though. The growth shoots are a little more potent and taste a little better, not as harsh. THC is in pretty much every part of the cannabis plant, it's just the female flower buds where it's most concentrated.