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The lab used standard smoking machines that simulate how consumers use the products

Nicotine products like cigarettes and chewing tobacco are scientifically proven to increase the chance of many different cancers
Detecting and adjusting for small-study effects in meta-analysis

E-cigarettes are known by many different names

Finally, it is possible that the results are not attributable to cigarettes per day per se but to some behavior correlated with higher smoking rates, such as poorer sleep
