Why definitive answers may take decades

Many of us probably have a hunch that vaping is bad for our health.

Questions about just how bad have been around for years.

So why, then, has there been a backlash by health researchers against a new study, that has now declared that the evidence is in, and e-cigarettes are likely to cause oral and lung cancer?

Today, science reporter Angus Dalton on the main warnings contained in this Australian study.

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