According to the World Health Organisation (WHO), there are many different types of e-cigarettes in use, also known as electronic nicotine delivery systems (ENDS) and sometimes electronic non-nicotine delivery systems (ENNDS)
They did account for whether people had medical visits or used other medications, but some important factors may not have been captured
The carbon monoxide prevents the blood system from effectively carrying oxygen around the body, specifically to vital organs such as the heart and brain, the experts said, adding that apart from regular smokers, those who inhale the smoke passively may also be at risk
They often seek out brands that align with their values, such as sustainability and fair labor practices
At present, all athletes can use nicotine freely and legally