People in this thread mention crazy volumes of 10-20% LorAnn (e.g. 1 ml in 5) for their mixes. I have the suspicion that my stuff is more concentrated (it came in tiny 3.7 ml bottles). In any case, I'm starting with less. I wish I still had access to my microlitre pipettes...
I think some of the flavours are stronger than others. I found apple and coconut to be fairly weak and had to use lots but others like pralines and cream were strong, just a little of these is enough for me.
Please be careful with inhaling colourings Denni, I wouldn't want anything bad to happen to you. I try not to inhale anything that doesn't serve a purpose in vapour, if I could get pure glycerine, propylene glycol, flavour and nicotine without any other additives I'd be happier.