Yes, thank you for that question.
This is an area where it is appropriate to recognize that you have to understand how complicated it is to change people's behaviour. You can be neither naive nor excessively sophisticated. It is extraordinarily difficult to change behaviour.
The tobacco example is an outstanding one because the first evidence about the risk of tobacco began appearing in the literature around 1955. Yet it has come to now before we actually have the rates of tobacco consumption down to 15%. But we are still going to see lung cancer surpass breast cancer as a cause of cancer deaths for women, because the smoking rates spiked some 10 or 15 years ago.
These are disasters, and when they are that complicated you have to recognize that your whole society has to unify itself in its message to try to end up with change, because it isn't solely the human behaviour that's involved. Our environments facilitate us doing these things.