[user104658]

I'd also add I suppose that the same is true for many emergency professions - police, paramedics, fire brigade etc. I have a friend who was in the police for less than a year in his early 20's and at this point (15+ years later) I think it's safe to say that it's messed him up for life. Stumbled upon a dead body in a pretty messed up state. He's had alternating cocaine/gambling problems ever since and now has significant debt/family issues. 6 months and he came out a totally different person.