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'An uncontrolled experiment'

Abbany, ZulfikarMay 20, 2013

The German Cancer Research Center (DKFZ) says e-cigarettes are unsafe and an 'uncontrolled experiment' on smokers. The DKFZ's Dr Martina Pötschke-Langer tells us how they work and why so many people use them as a means to stop smoking.

https://p.dw.com/p/18b5B

Interview: Zulfikar Abbany