Goodbye, war on smoking. Hello, war on fat.In a span of two months, smoking bans have been imposed in Scotland, enacted in England, Denmark, and Uruguay, proposed by the government of Portugal, and endorsed by the French public. China has banned new cigarette factories. In Virginia, our third most prolific tobacco state, senators voted to ban smoking in nearly all public places. The Arkansas legislature, backed by a Republican governor, passed a similar ban and voted to extend this policy to cars in which a child is present. Tobacco companies have won a skirmish here or there, but always in...