O. K. maybe there aren't many crackheads who traded their crack habit for nitro, you see crackheads use brillo to put in a glass stem to sorta act as a filter for smoking crack...... kind of a sick humor thing, we have a little inside joke that we run where I go in a convenience store and ask " where da brillo?". LOL If the clerk is a former crackhead he knows exactly whats going on and the people who are not .... well they don't even get it.