To speak to this. I've spent the last 5 years working 9-10 hour days 6 days a week. Over this time i've pretty much been chain smoking cigarettes and weed, drink every night, spent a couple years doing some...uhhhh interesting things...while still working....nearly fucked my life up toally. My health's deteriorated a fair bit. I'm congested constantly and I've had a chronic sinus infection for years, my back's fairly fucked.
It's kinda caused me to break down a bit, I quit a couple weeks ago and moved. I've been working a job lately with less hours, but different demands that haven't really made things much better.