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The variability in the primary outcome number of cigarettes smoked per day was higher than expected based on our earlier pilot study, leading to a large sample size re-estimation in the interim analysis

Although the sources vary, effective smoke control almost always comes back to the same fundamentals: filtration, gas-phase adsorption, and adequate airflow

Read More Learn more about the dagers of nicotine in our guide here.

The bill will close this loophole and make it an offence to give away a vaping product or coupon in England and Wales, which can later be redeemed for a vaping product, to someone who is under the age of 18. This seems sensible

Data analysis Data were analyzed using SPSS v.26.0 (SPSS Inc., Chicago, IL, USA)

If you want a no-smart features, five-year filter, built like a tank option: the Austin Air HealthMate Plus