Why do you think what people do is a better indication of what they want as oppose to what they say they want? For example, some addict wants to quit, but conti

Why do you think what people do is a better indication of what they want as oppose to what they say they want? For example, some addict wants to quit, but continue to abuse. I think a lot of modern tech is designed to make us addicts. So it's pretty apt example. And of course, using the market as the only indication of what people want is creating incentives that optimize for addiction.