Stephens, William E (2018). “Comparing the cancer potencies of emissions from vapourised nicotine products including e-cigarettes with those of tobacco smoke”. Tobacco Control27 (1): 10–17. doi:10.1136/tobaccocontrol-2017-053808. PMID28778971.
Stephens, William E (2018). “Comparing the cancer potencies of emissions from vapourised nicotine products including e-cigarettes with those of tobacco smoke”. Tobacco Control27 (1): 10–17. doi:10.1136/tobaccocontrol-2017-053808. PMID28778971.