Yes, that might be totally true. But I think it's more a substance problem than a problem of one particular substance. In the city where I live, everyone's hooked onto something or the other. It's going to be ridiculously hard to find someone not having an addiction.

It could be cigarettes, sex, alcohol, drugs, caffeine, impulse shopping, impulse travelling, sugar, fried food, and other kinds of junk food. The most common one is smoking.

Also, the three cups of caffeine that some people might crave before 11AM might be fine if they're tasked with the appropriate amount of work. The caffeine induced anxiety, stress, and high bp might only occur when the substance is consumed but the corresponding amount of work is not done to offset the caffeine. But thats just my personal experience. I could be wrong here.