e-cig

I have a lot of glycerine tincture that I want to turn into liquid for an e-cig pen. Somewhere I read that you just needed to cut the glycerin tincture with propylene glycol but now I can't find that article/directions. Can anyone tell me what I need to do to turn glycerin tincture into e-liquid...

The biggest problem to create e-liquids based on thc was the separation between liquid and thc (#¹) ...but now the problem is solved by terpenes !!! Liquid-product based on terpenes provide a very natural and familiar medium to emulsify and liquefy extracts without ever worrying about...