A total of 51 e-cigarettes were examined by TCLP and WET in two phases of research. The purpose of the testing was to provide a broad indication of whether these devices had the potential to be hazardous waste in the US. TCLP was performed on 23 e-cigarette samples in a preliminary survey of disposable e-cigarette products, representing 15 unique products from eight national and regional manufacturers or distributors (as labeled on the packaging).