Yes, police officers have shorter lifespans usually because of stress, unusual working hours, alcoholism/addiction as a result of the job, etc.

The study that was referenced indicated fumes and chemicals more than stress. As in all things pigg.. bring/present evidence. As I mentioned before, both the job of a fireman and police officer involved long periods of boredom punctuated by brief periods of panic/stress. Military people have a much more stressful life in times of war than either fire or police. In the case of the military, the other guy is trying to really kill you and often has military specific training to do it.

And yes, school teacher is more stressful than police because the school teacher is forbidden from protecting themselves (no gun, if you strike back when stricken – you get sued/fired – check out assaults against teachers), depending on locale, not every kid is interested in learning. Inner city schools are the worst because you are almost in the middle of an armed camp.

It is one of the most stressful, depressing, and difficult jobs out there.

Not exactly.. but I also do know that some of the stress is the stress they create themselves. Many police officers have a them vs us mentality.. not healthy.