Erdos was a drug user, not a drug addict. He famously quit drugs for a month just to show that he was not an addict. And though he was technically homeless, he

Erdos was a drug user, not a drug addict. He famously quit drugs for a month just to show that he was not an addict. And though he was technically homeless, he was not what most people imagine when they hear this word. He merely preferred to spend his life traveling, and had many friends everywhere (which comes with the territory if you're eminent). His most salient characteristics--eccentricity and lack of concern for non-mathematical things--are common to most mathematicians.