It's Russian Roulette like anything else bro. If you look in the current issue of Flex with Johnnie Jackson on the cover you'll see two stories of bodybuilders dying in their 30's. Andreas Munzer died at 31 due to internal bleeding (the roids, GH, and insulin destroyed his liver and since your liver is responsible for manufacturing clotting factors, no clotting factors = hemorrhage) and some guy they called "Momo" died at 33 backstage at a contest due to diuretic abuse (Lasix depletes potassium --> hypokalemia --> deadly arrythmias).
Personally I see no reason to be on all the time. I take about 4-6 months off a year and I'm going to be competing soon. And even friends of mine that compete and take almost no time off are smaller and weaker than me. The only thing that non-stop use seems to afford them is they stay a little leaner. But to be honest, I had some bloodwork done recently and it was downright scary. There's a history of heart disease in my family so I'm finishing up this last week of AAS and just running a few more months of GH. Just to give some perspective, AAS ABUSE is probably the worst thing you can do for your cardiovascular health. It drops your HDL (good chol), raises your LDL (bad chol), raises triglycerides, etc. Hi estrogen states (i.e. using lots of test,anadrol, deca without an AI) lead to hypercoagulable states (blood clots easier --> easier to get a heart attack or stroke), but if you think you're clever and use an AI or something that doesnt aromatize like Tren, this leads to the aformentioned dyslipidemia. So its 6 in one, half dozen in the other in terms of how you want to damage your heart.
So basically what I'm trying to say is that this BBing game is a crap shoot. Unfortunately, if taken to the extreme, you can end up paying with your life. So I've said it before and I'll say it again, if you dont plan on competing, bag the AAS. It's simply not worth it. Is this the pot calling the kettle black? Yes...but I've made my own decisions and I feel obligated to share what I've learned. Without getting into details, the one thing that I am 100% sure of is that AAS use is not for everyone, its not for the guys that wanna look good on the beach, its not for young athletes to use so they can please their low life coaches...Its serious stuff and I just happen to feel that the risks are not worth it unless you're making a living off of your bodybuilding efforts/modeling/etc.
Just my $.02