How to distinguish a dual user from an exclusive e-cigarette user
RIVM and Maastricht University have identified a combination of factors that can be used to distinguish between exclusive e-cigarette users (vapers) on the one hand and people who smoke both regula
![e-sigaret](/sites/default/files/styles/thumbnail/public/2019-12/foto%20bij%20e-sigaret.jpg?h=1f4c110d&itok=3Eec4-ak)