a roach is just the little part that is left wen the joint is low. like a cigarete butt, but with weed in it. and u can save the roach if u want cause if u had a pipe u can put the roach weed in the pipe. well anyway yes u could quit after once. u might not even get high ur first time. depends if u smoke it right. take a hit suck it into ur lungs and hold it in as long as u can.