Heading to Paris later this year. Can I take my vape pen and cartridge?
this is what the TSA says about it: https://www.tsa.gov/travel/security-screening/whatcanibring/items/electronic-cigarettes-and-vaping-devices
You'd need to check the regulations for any other airports and countries you pass through on the way to and from Paris.
Depends on what's in the cartridge.
If you are talking about cannabis that would be a big no. Cannabis is illegal in France and it would be international transporting.