31st May marks World No Tobacco Day 2018, organised by the World Health Organisation (WHO) to help remind us all of the dangers of smoking and how it may affect our own health and that of those around us.
Many of us are now trying to quit smoking with the help of e-cigarettes, but by using the devices we may be exposing ourselves to a new health risk.
The last few years have seen a rise in the number of studies looking into what potential dangers e-cigarettes may bring, and although some have produced conflicting results it seems they are not as harmless as once thought.
Here are some of the recent research to show what we know so far, and why World No Tobacco Day might be a good time to quit e-cigarettes as well as conventional cigarettes.
Increased risk of heart attack
A large-scale study that looked at data from nearly 70,000 participants found that daily e-cigarette use was associated with nearly double the risk of having a heart attack. Smoking tobacco cigarettes each day was associated with nearly three times the risk, and using both together on a daily basis leads to five times the risk of heart attack, when compared to non-smokers. Preliminary research from University of Louisville also found that popular chemicals used to flavour e-cigarette liquids may cause changes or damage to heart muscle cells.
Harmful to the immune system
US research published earlier this year found that the chemicals used to flavour e-cigarette liquids, which are heated up by the device to create a vapour which users then inhale, are toxic to white blood cells. The team directly exposed a type of white blood cell called monocytes, which help the body fight infection, to a selection of e-liquids. They found out that the flavouring chemicals and liquids can cause significant inflammation to cells, with many of the chemicals also causing significant cell death. Some flavours were found to be more damaging than others, with cinnamon, vanilla, and buttery flavours among the most harmful.
Increased risk of pneumonia
A UK study found that e-cigarettes may increase the risk of developing pneumonia, as they can prompt pneumonia-causing bacteria to stick to cells lining the airways, increasing susceptibility to the disease. The study did not directly compare the risk of e-cigarettes to tobacco cigarettes, but the researchers said the results suggest that those who use e-cigs may be at higher risk of lung infection than people who do not use the devices.
Damage to oral health
According to a 2016 US study, electronic cigarettes are also just as damaging to gums and teeth as conventional tobacco cigarettes. The researchers found that when gum tissue is exposed to the vapours from e-cigarettes, the cells released inflammatory proteins which aggravated stress within cells, potentially causing damage which can lead to various oral diseases. Some of the flavouring chemicals used in e-cigarettes also made the cell damage worse.