I agree with Possum. When used appropriately as a rescue medication they can be quite helpful with little tolerance. The problem is about 10% of the population appears to have an "allergy" to these types of medications. When I use the word allergy I mean it in the sense that their brain chemistry is different and it can trigger an underlying genetic predisposition towards addiction. And while I understand the response of the second poster, it's not quite as easy as calling it bad choices. While certainly bad choices are involved, once a chemical has flipped a switch in an addicted brain they are no longer making the choices...the chemicals are making the choices. I work with addicts for a living, and if it were merely about making bad choices, you would see people who make bad choices in other areas of their life the only ones with problems. But, i treat nuns, priests, doctors, lawyers, airiline pilots, nurses, etc...people who have shown will power and good choice making all their life fall into problems because they are hard wired for addiction.
So, I always caution people that medications like this are not without risk. You should discuss these risks with your physician specifically looking at family history and your own history with mood altering chemicals. The last thing you want to add to your anxiety issues is an addiction issue. We should tread with caution when approaching medications that play with brain chemistry.