But something that stands to "kill you right now" is a bit of a different beast to most of us. And in that regard, Steve is exactly right... put the startup in context: No matter how stressful it is, or what's going on, it's till not life and death in the sense of how most people use that term.
My own version of this comes from having been a volunteer firefighter for about a decade.. a period during which I had at least 3 experiences where I came very close to being seriously injured or killed (and was lucky enough to escape all 3 unscathed). I was also a 911 dispatcher during part of that same period, so I spent a lot of time up close and personal with literal "life and death" situations. When you've been there, it changes the way you look at the day in, day out stuff that goes on in business. Yeah, it's important... but it's never that important.
If he was 30 with those habits, he might have, indeed died.
The consequences of this stuff could actually be life and death. That said, the risk for most people is quite low.