Views on vaping and electronic cigarettes

Hi,
What are your thoughts on vaping and electronic cigarettes as an alternative to traditional cigarettes. Using them to keep me off cigarettes but never sure if they are safe to use with regards to the sleep apnoea and lung issues.

Please help.

I didn't find the right solution from the Internet.

References:
www.cpaptalk.com/viewtopic/t110208/Views-on-vaping-and-electronic-cigarettes.html
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Thanks