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These reusable, patented filter tips with an internal washable screen are designed to significantly reduce harsh smoke, tar, and resin, ensuring a smoother and cleaner hit every time

The paraffin wax, and possible lead wick, release dangerous particulate matter into the air when burned

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The effects are greatest in teens, then young adults, and less so in adults over 25. Not everyone is as convinced as Lisdahl, and the debate has sometimes played out quite publicly in the research world

These two cigarettes were chosen because 3R4F is the most widely used research cigarette in the literature, whereas 1R6F is newly developed to better reflect products currently on the market