After years of being chronically on any medication that vasoconstricts, the intrinsic muscles of your blood vessels grow thicker, in order to more thriftily accommodate the constant commands they're receiving, through their catecholamine receptors, to contract. This smooth muscle hypertrophy is not reversible, and accounts in some part for the "hardening of arteries", and stubbornly high blood pressure, seen in long term smokers and people on chronic steroids.
With this increased systemic vascular resistance, your heart has to work harder to create a pressure head strong enough to perfuse the whole body (miles of blood vessels!), making it much more likely to distort or even eventually fail. And your odds of a vessel rupture and aneurysm are much higher, if you happen to have an inborn defect in the walls of any blood vessel -- that's like running a very high volume of water through a cracked hose.
So I guess it depends what you mean by cocaine abuse. If you're under the influence of cocaine all day every day for decades, I'd say your odds of dying are probably appreciably elevated, especially when you consider that most people who use cocaine (or amphetamines) in a pattern like this do not tend to be otherwise vigilant stewards of their body's health. (Why does an indefeatable superhero need to work out, quit smoking and drinking, and eat well, after all?) I'll grant that someone who otherwise optimizes their care of their health, for whom heavy coke use is nearly their only bodily vice, can probably significantly lower their risk of serious adverse health outcomes and early death. But probably not to the levels of someone who does all that good stuff and never touches coke.
On the other hand, I have reason to believe that very moderate, occasional use of drugs that vasoconstrict and raise systemic blood pressure is probably not all that dangerous for someone who is in otherwise excellent cardiovascular health. After all, your vascular muscle tone (and blood pressure, consequently) naturally fluctuate a lot over the course of a day or a week, in neurohormonal response to all sorts of natural stimuli. It's prolonged and frequent vasoconstriction that gets people into trouble.
