Researchers at the University of Southern California surveyed 181 10th-graders from 10 high schools in the Los Angeles area who had reported vaping in the previous 30 days, then followed up six months later, when the students were 11th-graders. The teens answered questions about how much and how often they had smoked and vaped in the past 30 days and about the amount of nicotine in their vaping liquid. The researchers categorized the amount of nicotine as none, low (up to 5 milligrams per milliliter), medium (6 to 17 mg/mL) or high (18 mg/mL or more).
With each step up in nicotine concentration, teens were about twice as likely to report frequent smoking versus no smoking at the six-month follow-up. Teens who vaped a high-nicotine liquid smoked seven times as many cigarettes per day as those who vaped without nicotine.
Also with each nicotine level increase, teens were about 1½ times as likely to report frequent vaping than no vaping at all. Vaping high-nicotine eliquid led to almost 2½ times as many episodes of vaping per day compared with no-nicotine vaping, and kids took more puffs each time they vaped.
Read more at sciencenews.org