Working 18 hours per day was tough, at the beginning coffee helped a lot. However I started loosing friends and the little free time I had, I spent it drinking, lonely in anonymous pubs, trying to socialise.
Workload increased and stress started to affect me, so I began smoking weed to relax.
To recover and work with renewed energy coffee was not enough anymore, I started with pills, amphetamines, coke, crack. After the biggest deployments I would disappear for days in an opium den.

Work, it's a gateway drug.