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However, the long-term effects of all flavour chemicals used by this industry (which are more than 15,000) remain unknown and they are not usually included in the product label [78]. Furthermore, there is no safety guarantee since they may harbour potential toxic or irritating properties [5]. In addition to its toxicological effects on foetus development, nicotine can disrupt brain development in adolescents and young adults [44,45,46]. Several studies have also suggested that nicotine is potentially carcinogenic (reviewed in [41]), but more work is needed to prove its carcinogenicity independently of the combustion products of tobacco [47].

The success of all these enterprises hinges on the claim that e-cigarettes are healthier than traditional cigarettes. Companies like to paint a black-and-white picture of a new era of safe smoking. "Cigarettes, you've met your match," NJOY proudly proclaims in its Super Bowl ads. E-cigarettes and vaping are part of a trend going back at least nine years in the U.S. First publicized as a safer alternative to smoking tobacco, vaping caught on because it didn’t contain the carcinogens or tars found in most smoking tobacco products. Also, vaping was supposed to eliminate the dangers of secondhand smoke to those nearby.

Current evidence indicates that using e-cigarettes is dangerous, especially for young people and people who have never smoked. In young people, the use of nicotine can impact the reward system in the brain. In time, this can make the use of other drugs, such as cocaine, more pleasurable, according to the National Institute on Drug Abuse (NIDA).

A 2018 study assessed the lung function of 10 people who had never smoked cigarettes immediately after vaping fluids, either with or without nicotine. However, the researchers concluded that, overall, vaping is thought to be less harmful to the heart than smoking cigarettes. However, they found that people who smoked conventional cigarettes and e-cigarettes were more likely to have heart disease. In a recently published randomised trial of 886 subjects who were willing to quit smoking [100], the abstinence rate was found to be twice as high in the e-cigarette group than in the nicotine-replacement group (18.0% vs. 9.9%) after 1&nbsp