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Hydrogen cyanide Prussic acid, or hydrogen cyanide, is a colorless, very toxic and fast-acting substance that smells like bitter almonds and prevents the combustion of oxygen in the cells by blocking respiratory enzymes

DOI: 10.1002/14651858.CD004307.pub7 Never miss a breakthrough: Join the SciTechDaily newsletter

The ratio of the filter length to the tobacco portion can reach 6:4, and it employs a three-stage, triple-layer filter design

Then, using an electroencephalogram (EEG) to monitor participants' sleep at home, the researchers found the smoking group accumulated more light sleep than the nonsmoking group, while the nonsmoking group experienced more restorative, deep sleep