The CDC told everyone to "consider" stopping vaping immediately, despite the lack of evidence it was linked to commercial ecigs. It sure seemed like a beautiful play by big tobacco (which manufactures packs of cigarettes for 6 cents a piece -- and would rather kill vaping than try to compete in tech). Note that CDC was swept out by Trump, to avoid fingering handguns as a public health threat.

https://www.cdc.gov/mmwr/volumes/68/wr/mm6841e3.htm