I think most people have no idea what is going on and literally would not be able to understand it even if it were laid out in black and white. Even then, most people "understand" that smoking causes cancer. Behavior is not always a good predictor of people's internal mental states. Addiction is real. Damn that dopamine. Is smoking somehow fine because lots of people do it and it kills you slow? (I say that as someone who can't help but have a cig now and then).