Man this is a good thread i was wondering this too along time ago. I was blazn up in this kids basement and his sister is a crackhead and she had some shit on her lip. she got the pipe b4 me and when she passed it to me I took my lighter and cooked the mouth piece right in front of her and I just inhaled it with out touching it. I was always worried Id catch some ish from that dirty bitch or her brother from smoking. Now that I know you can im glad I always cooked the mouth pieces and blunt tips.