omg! ugh,
didn't mean to be offensive, but facts of life / biology can be a bit ewww

I think it is really important NOT to introduce outside bacteria into the lung tissues.
Unlike our stomachs, which has strong acids as well as flora and fauna that eat things, the lungs really don't have as many *protections*.
I also would never poor previously-vaped juice out of a clearomizer back into a juice bottle for the same reason.
Drip tips are especially prone to a lot of germs, because we are not disposing them like we did with cigs. I would carry alcohol wipes or wash in sink as often as I wash my hands during the day.