Gotta say, my brother got me into the oil cartridges. You screw them into a battery such as the “hush pen” and it really is the smartest and most inconspicuous way to do it in public, hands down. 5 Taps in the bottom turns it in, 3 taps changes temp. Two taps to preheat it otherwise - just inhale. Nobody bats an eye, looks just like an ecig. Def smells like fresh weed on the exhale. Takes a few min to feel it but goddamn can the eff you up. I’m kin of spoiled from them now because now even my vapcap and dugout seem like a hassle although the different highs are a nice change.