O f coars you can, you can get HIV if someone infected leaves a little blood on a pipe and you get it in your mouth. Never every smoke with people who have cold sores, never smoke with people who have herpies or any kinda transmitted desises. Even out of respect I alwyas burn the moth peice of the pipe before and after I toke. I got a good friend who we know is clean but he gets cold sores all the time, we wont smoke joints with him ever, And we know hes clean we sent him to the doctor, but its just nasty. Protect your self or your gonna get Jock itch from sitting on the worng toilet stall or even the wrong chair.

Comon sence--------even in gym class they wash that rope