Can anyone give me info on these? I bought a bunch of them and watched a video on how to fill them. I filled one and put my finger of the bottom and made quite a few hard draws to draw up the liquid into the carto. I took a hit and barely got anything, so I let it sit overnight and tried it again, this morning. I'm barely getting anything out of it at all! I checked the ohms and its only 1.5. I ended up buying 6 of these things! Is this how they are or am I doing something wrong?