There are a few rare exceptions, but they are unreliable
But practically speaking, the inspection program that the FDA has in place only happens in the U.S. Of more than 500 tobacco-related inspections conducted since the FDA gained authority over e-cigarettes, only two were in China, according to the agencys public database
Despite these natural ingredients, they still emit many of the same harmful chemicals that cigarettes have, such as tar and carbon monoxide, according to the NCI
Gene 366:216 Northrup TF, Khan AM, Jacob P 3rd, Benowitz NL, Hoh E, Hovell MF, Matt GE, Stotts AL (2016) Thirdhand smoke contamination in hospital settings: assessing exposure risk for vulnerable paediatric patients