The document discusses tax incidence and how the burden of taxes shifts between sellers and consumers. It explains that when a tax is imposed on cigarettes, the initial burden falls on the seller but they can shift it to consumers by raising prices. Whether the tax burden ultimately falls more on sellers or consumers depends on the elasticity of supply and demand - the more inelastic side bears more of the tax burden. Specifically, if supply is elastic then sellers are sensitive to price changes and consumers will end up paying the tax through higher prices.