I've done this both ways.
- First be aware that you cannot put lithium
batteries in your checked bags.
- I've taken my
batteries out of my
mods and gone through security with no issues.
- I recently left my mods assembled, and even brought them to the attention of security before going through x-ray, (a provari, lavatube, etc.) I was put through the pat down, extra security checks, checked for explosive residue.
I actually did the last one on purpose. I wanted them to see advancd ecig mods that aren't your run of the mill over the counter gas station models. It probably took an extra 10 minutes.
Obviously, any liquid you're carrying on has to be in your clear quart size baggy.