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For those who have stuck it out, the effort has required true grit. "I couldn't have made it without snuff," says Darrell Chiles, manager of a Greenfield manufacturing plant. "It smells like horse manure, but a little pinch in the side of the cheek really helps." Other sufferers swear by such substitutes as plastic cigarettes, chewing gum, Life Savers, unlighted stogies and tranquilizers. Many of them simply eat more. That will mean diets—next year.