Scientists Warn: Vaping Likely Causes Cancer Bioconcept Pharma fabricant d'e liquides franais et revendeur de cigarettes lectroniques E cigarettes are likely to cause cancer, including in the lungs and mouth, according to a sweeping review of scientific evidence that challenges their positioning as a safer alternative to smoking. There is Vapes and e cigarettes often contain nicotine, heavy metals, and carcinogensand can harm developing brains, affect mood and learning, and lead to lasting lung damage. Just one hit can start an addiction.