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Juul Labs Inc. pursued a strategy to win over Washington. But the e-cigarette maker wound up further alienating regulators, helping to thrust the once-soaring startup into a crisis that threatens its business. Facing scrutiny stemming from surging teen use of its vaporizers, Juul has tried over the past year to position itself as a responsible actor in an industry with few rules. It overhauled its marketing, halted retail-store sales of its fruity flavors that young people favor and introduced a checkout system to curb illegal sales to minors.