The California Department of Public Health (CDPH), has been carrying out air sampling in vape shops throughout the state, as part of its initiative to determine the health effects of second-hand vapor exposure.

In what has certainly left many public health experts rolling their eyes, the US Centers for Disease Control and Prevention (CDC) has just announced a "Major Breakthrough", one that the former have been insisting on for the last few months: the infamous outbreak of EVALI, is almost certainly not linked with vaping legal nicotine products.

In recent years, countless headlines linking vaping to popcorn lung surfaced across the media. But what does scientific evidence tell us? Is there a really a connection between the two?

A long term study looking for possible lung damage after a cohort of non-smokers had used e-cigarettes daily for a number of years, indicated that these vapers suffered no lung damage, when their results were compared with those of non-vapers.

A study by the University of Cambridge may have just explained why some teens are drawn to smoking and become addicted to nicotine more than others, and how it may be linked to their brain structure.

Michael Mosley investigates the dramatic rise in e-cigarettes.