Why do tobacco companies continue selling cigarrettes?

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I think most people are already aware about the harm that smoking can do to our bodies, not excusing the owners of these giant tobacco companies. However, people still keep on buying and using while tobacco companies keep on making and selling. In my opinion, the latter keeps on producing cigarrettes just to make money without even caring about the effect that it can give to smokers and non-smokers. Do you think they are just simply being selfish?