it's just an anology
crack in the sense is used to say that people who relax have to get a retouch ever so often. It's not to say that relaxers are lethal like crack.
sometimes people read more into something than is necessary. I see some members typing a whole essay on it......jeez.... c'mon
it is not a POSITIVE analogy. i don't like it and it annoys me (and clearly a lot of other people, too). it doesn't bother you and like i said that is cool.
no one is trying to convice you to come to the other side. if people feel so strongly about it to type "a whole essay on it" what difference does it make?