E-cigarettes And Being Pregnant Maternal Toddler Health One of the primary studies in humans involved the evaluation of 9 volunteers that consumed e-cigarettes, with or with out nicotine, in a ventilated room for 2 h . Pollutants in indoor air, exhaled nitric oxide (NO) and urinary metabolite profiles were analysed. The outcomes of this acute experiment revealed that e-cigarettes aren't emission-free...