Im 13 days cigarette free, I know that can cause mouth sores/ulcers. But can certain juices cause them as well? Last time I quit for 3 weeks and never got them. Im vaping boss reserve, 6 nicotine and before that I was vaping unicorn milk. Both by cuttwood. Some one told me to switch PG and vg around so what is the PG and vg in what I'm currently vaping and what should I switch too?