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Scientists have discovered that certain vaping aromas could increase the risk of heart attack or stroke.
Research at the Stanford University School of Medicine revealed that – among several flavors tested – the aromas of cinnamon and menthol were the most damaging.
The study found that blood vessels, when exposed to a spray liquid, began to exhibit "significantly higher levels" of cell death and damage to DNA.
They also discovered that it varies from one flavor to the other.
The types of electronic fluids badyzed include fruit, sweet tobacco, menthol, caramel and vanilla, butterscotch, cinnamon and tobacco. They also tested e-liquids with varied nicotine content.
They examined those containing six milligrams of nicotine, zero milligrams and eighteen milligrams.
After their research, they concluded that the aromas of cinnamon and menthol were the worst for your cells and your DNA.
Professor Joseph Wu, lead author of the study, said: "Up to now, we had no data on how these e-liquids affect human endothelial cells.
"This study clearly shows that e-cigarettes are not a safe alternative to traditional cigarettes.
"When we exposed the cells to six different flavors of e-liquid with different levels of nicotine, we found significant damage."
Their study showed that in most cases, liquids were "moderately toxic" to cells, while there was "dramatically increased" cellular damage revealed by cinnamon and menthol liquids.
This includes variations without nicotine.
It has also been suggested that several types of e-liquid aroma can adversely affect lung function.
The findings, published in the Journal of the American College of Cardiology, claimed that caramel and popcorn flavors could also disrupt cell growth. Neither the cinnamon nor the caramel and vanilla aromas were so bad for disrupting cell growth, but both showed several signs of inflammation and endothelial dysfunction.
In the same study, scientists examined the amount of nicotine absorbed in the blood between those who smoke traditional cigarettes and those who sweat.
After 10 minutes of smoking, nicotine levels were comparable between the two.
Dr. Won Hee Lee, Associate Professor at the University of Arizona, said, "When you smoke a traditional cigarette, you have an idea of how many cigarettes you smoke.
"But e-cigarettes can be misleading. It is much easier to expose yourself to a much higher level of nicotine over a shorter period of time.
"And we now know that e-cigarettes are also likely to have other, significantly toxic effects on vascular function.
"It's important for e-cigarette users to realize that these chemicals are circulating in their bodies and harming their vascular health."
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