well ive heard many terms relating to how high a person is.. from lowest to highest

buzzed
floaty
high
stoned
baked
ripped (usually refering to being really high off a bong after taking rips)
then they various terms all meaning really fuckin high: blown, faded, chonged, blitzed, melted.. oh yeah and geeked, or if your a newcommer o smoking or just getting so high you act like it's your first time and get stupid we call it noobin'

that's about all ive heard around here