Adobe recently debuted "Make It Now," a series of short videos which demonstrate how to accomplish various tasks with Adobe Creative Cloud tools. "How to Make a Double Exposure in Photoshop," can be seen above while the remaining videos released thus far can be seen below.
I would suggest a 15w battery or higher. That will give you plenty of smoke. The one I used in the video was an Eleaf iStick 50W which a friend gave to me. Turned out to be way overkill so 15+ watts would be fine. The battery I used charges via USB but some units will need one or two 18650 batteries.
There are tons of tanks out there but I used an Nautilus Atlantis tank.
Again, many different kinds/brands. I went with a no nicotine version.