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Situations where people choose carbon filters Activated carbon smoking filters may feel worth it for people who: strongly dislike harsh smoke want a filter option for roll-your-own products care about reducing smell as much as possible prefer a cooler, smoother draw are willing to pay extra for small reductions in certain compounds They may feel less worth it for people who: want the cheapest option do not notice harshness do not want extra steps or extra parts expect the filter to make smoking safe Activated carbon smoking filters can help in a limited, realistic way

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Strongin, R

"In this time when weve got a budget issue, weve got impacts from HR1

We used an adaptive design, which means that part-way through data collection, an interim analysis was conducted to assess how many more participants would need to be recruited for the study to have enough statistical power to detect an effect of pack size