Lawsuits on behalf of young consumers have been filed against e-cigarette maker Juul Labs Inc and others are expected amid increasing scrutiny. The lawsuits target Juul, which markets a nicotine-vaping device and controls about 75% of the e-cigarette market. * Most of the plaintiffs allege that users became addicted to Juul, but at least two lawsuits go further. * Lawsuits filed in federal …