Nicotine vaping is likely to cause lung and oral cancers, a comprehensive review of more than 100 studies has concluded. According to the analysis, human and animal studies, as well as cell experiments looking at the effects of chemicals found in vape liquid, all point toward carcinogenicity. Those studies, published since 2017, record "increasing concern", the researchers report . We don't have long-term, population-level data yet, so the exact risk cannot be quantified, but the early signs