According to a report by Public Health England (PHE) published on gov.uk, e-smokers' risk of cancer has been significantly reduced by reducing quite 70 known carcinogens in traditional cigarettes - with the potential risk being but 0.5% of that of traditional smokers.

　　The findings are supported previous research at the University of St Andrews within the UK. The study, which excluded disturbing information, found out an impact group and modeled similar data, concluded that the relative cancer risk of e-cigarettes was only about 0.4 percent of that of conventional cigarettes, but 0.5 percent.

　　The report also cites a study by a medical research team at Aberdeen Royal Hospital within the UK, which claims e-cigarettes have great "harm reduction" potential which their popularity may be a good thing, with traditional cigarette smokers switching to e-cigarettes to significantly reduce their health risks.

　　Data from the planet Health Organisation (WHO) confirm that the amount of smokers worldwide is decreasing year by year. The department of Public Health report linked the prevalence of e-cigarettes to a possible decline in smoking. Some 2.9 million adults within the UK used e-cigarettes in 2017 (about 6% of the population), and therefore the number of individuals using both has stopped growing within the past two years, with more smokers switching from traditional cigarettes to e-cigarettes altogether. "Quitting rates are higher when people start using e-cigarettes. this is often also the foremost common reason for people to offer up traditional cigarettes and use e-cigarettes."

　　Although 1 percent of e-smokers had never smoked before, an independent review by Public Health England concluded that e-cigarettes were unlikely to "disrupt the long-term decline in smoking rates".

　　The Aberdeen Royal Hospital team said traditional cigarette smokers faced a greater risk of death from heart condition and related diseases than cancer. Ultra-fine particles in cigarettes travel into the bloodstream with cigarette smoke, potentially triggering inflammation which will damage the guts and cardiovascular system . disorder kills significantly more smokers annually than cancer. the danger was independent of the amount of cigarettes smoked, and even only one traditional cigarette each day increased the danger of heart condition by half to twenty cigarettes each day .

　　The jury remains out on the cardiovascular effects of e-cigarette smoke. Compared with a few years of traditional cigarette research and extensive evidence of harm, medical research on e-cigarettes remains in its infancy. a press release issued by the NHS Scotland and signed by the Royal College of drugs in Edinburgh previously said: "It could also be a few years before the medical community has enough evidence to form an absolute judgment on the pros and cons of e-cigarettes. the talk over the security of e-cigarettes continues." But Public Health England concluded that "e-cigarettes are far less harmful than traditional cigarettes".