How do you successfully co-found a massive hit while being addicted to heroin?
Most people think of the homeless or bums when they think of heroin addiction but there are a lot of very functioning addicts out there in the corporate world
The problems are 1) heroin is highly addictive and has an absolutely ferocious withdrawal and 2) heroin is really easy to overdose.
So, as long as you keep the heroin going, you're "good". The problems all start when the heroin stops.