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Findings that nicotine levels are similar between vaping and smoking are consistent with our systematic review of nicotine exposure among adults who had vaped for a period of time.16 Levels of TNE-2 among participants who had exclusively vaped in our sample (GM=5.09 nmol) were greater than among samples from youth in England (GM=1.60 nmol), the USA (GM=3.88 nmol) and Canada (GM=3.96 nmol), collected in our earlier study from 2019 to 2022.19 These differences may be due to changes in the devices and e-liquids that youth used, as the use of disposable products, which contain high concentrations of nicotine (20 mg/mL), and the use of salt-based e-liquids increased substantially among youth in England between the two study periods (10% in 2021, 83% in 2023).41 Previous research has indicated that salt products are associated with higher nicotine exposure.42 We were unable to compare nicotine types or other device characteristics in this study due to a lack of variation, but most of the sample used disposable vapes, 20 mg/mL nicotine concentrations and nicotine salt e-liquids

If you notice dizziness repeatedly, reducing nicotine exposure or stopping use until you speak with a healthcare professional may be the safest approach

The Universal 20-Pack Baseline Globally, the standard commercial box contains 20 cigarettes

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