Health - How bad are Benzodiazepines for your health?

Ok so just about everyone knows that abuse of drugs like cocaine for example will lead to some pretty serious health complications (high blood pressure, hearth issues, damaged septum, ect.) but what about Benzos? Besides the obvious addiction potential and the withdrawal symptoms that go along with it, what type of damage will abusing benzos do to your body/brain? Do they permanently alter your brain chemistry? What about if you take them as prescribed or responsibly (IE not taking 4 mgs of Xanax in a sitting). SWIM is just curious as to how bad benzos are for your health, right now SWIM’s believes they are not very damaging as long as you don’t take the lightly, understand that the addiction potential is high and use them in moderation and responsibly. But SWIM may be totally wrong in this belief.