Need some help folks. I've been looking at switching to vapes from roll ups, and ive been considering the Artery Nugget, its not too big and seems to be fairly more portable than some of the larger ones and reviews look pretty good too. But there are so many to choose from i dont really know where to start, for instance, would it better to get a different tank, or maybe consider a completely different vaping device. What are ohms? Sub ohms? If it helps im not too bothered about about size or density of the vape clouds.