Smoke without fire: What's the truth on e cigarettes? New Scientist E Cigarette and Vape Market Report 2026 Research and Markets Vaping on the rise in U.S., especially among young people Pew Research Center Critical research gaps in electronic cigarette devices and nicotine aerosols ScienceDirect Knowledge and use of e cigarettes among nursing students: results from a cross sectional survey in north eastern Italy BMC Public Health Springer Nature Link E cigarettes helped 18,000 people quit smoking in 2015 but long term effects still unknown