aviator...
Some flavors are known to be unsafe when vaped....particularly those that contain oil. To confuse the matter further, candy flavorings are often called "flavor oil" or "candy oil" when some don't contain oil at all. So you have to review the DIY section from spaceball's link posted above in post # 5. Read the save vs unsafe list. Then get safe simple flavors.
The thing is that you have to order nic base anyway. Most of the places that sell nic base also sell flavorings that have been "screened" to some degree.
Also, flavorings are a major safety issue for some...there are vapers that vape unflavored for that reason. We really know so little about this from a long-term effect standpoint. As for me, I flavor my liquid because I'm not a fan of
vaping unflavored e-juice.
Hooka is a different animal, IMO. They use a lot of flavorings that I wouldn't put in e-juice IMO....molasses for one. If you use em make sure you know what they are and cross check them with the info in the DIY area. Get the candy flavorings like some of the LorAnn's. FYI - Most cherry flavor ususally sucks.