Painful accidents involving burns and explosions have been recorded with increasing frequency over the past year as use of e-cigarettes has climbed, with faulty batteries seen as the suspected culprit.
Source: Huff, puff and explode: E-cigarette fires, injuries on rise | Health | stltoday.com
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These are called product liability lawsuits. They focus on defects in design or failure of parts. Injured persons may seek monetary damages as a result.