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The growing popularity of slim formats also reflects how strongly real-world users prioritise a low-profile experience

Smoking increases blood pressure and damages blood vessels

The scans showed more instances of airway inflammation among marijuana smokers compared to people who smoked cigarettes only or not at all

"Battery voltage and unit circuitry differences can result in considerable variability in the products' ability to heat the solution to an aerosol and, consequently, may affect delivery of nicotine and other constituents, and may contribute to the formation of toxicants in the emissions," WHO says in a 2014 report on e-cigarettes

Archived from the original on 14 February 2022

We are grateful to Lizzy Dann for her assistance with data collection