US health officials have recommended that people refrain from using e-cigarettes as they investigate a severe lung illness that has killed eight people. Here are some things to consider.

Allegations of illegal marketing tactics. More than 500 cases of severe lung illness in 38 US states. Seven deaths. A proposed federal ban of most flavoured e-cigarettes and new efforts in many states to counter an epidemic of youth vaping.

There's been an avalanche of vaping news this month, which leaves many users facing a crucial question: Is it time to quit? Here's a look at the issues.

First, how big

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Is vaping safer than smoking?

A new generation of young people addicted

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What about THC?

Public officials are warning people not to vape