This is nothing like alcoholism or lung cancer. We are creating increasingly resistent strains of bacteria that will be a plague on all. And drug abuse is illegal.
The most frightening thing about this particular plague is the ease with which it can spread to those who do not engage in the risky behavior. Consider the possibility that a gay with highly resistant staphylococcus bacteria uses a restroom before a person with an open wound (not yet healed). The likelihood of transmission is there and without any untoward behavior. Pretty scary.
If you cheat and read the end of the book...the bugs win. Their more adaptable.