dude dont get me wrong I love rollercoasters and if I were stoned I wouldnt get sick or anything. The adrenaline rush of a rollercoaster totally cancels out my buzz everytime. It's fun as hell though going up the first mountain and waiting while the anticipation just builds and builds. But after the first dive you forget that youre stoned. Its the same with sex or playin a sport and other stuff as well for me.
i've done it - went to six flag new england and smoked in the parking lot and went in, did the rides = great time. i love roller coasters anyways so being high just made it better.