People who smoke and vape are less able to break free of their nicotine addiction than folks who only have one of those habits, a new review concludes. Instead, these "dual users" are more likely to eventually drop vaping and continue smoking tobacco,

But just 24% of dual users quit nicotine completely within two years, compared with 25% of people who only smoke and 35% of people who only vape, researchers found. On the other hand, more than half (55%) of dual users switched to cigarettes only after two years.

People who vape while still smoking cigarettes are less likely to successfully quit than those who only do one or the other, a new study said on Wednesday.Over that period, eight percent of people who exclusively vaped quit,