Image: © The Authors 2018. Published by Oxford University Press on behalf of the Society for Research on Nicotine and Tobacco. Originally published in: Krüsemann EJZ, Boesveldt S, de Graaf K, Talhout R. 2019. An e-liquid flavor wheel: a shared vocabulary based on systematically reviewing e-liquid flavor classifications in literature. Nicotine Tob Res 21(10):1310–1319, DOI: 10.1093/ntr/nty