Forgive me if I am misreading this but I think you are saying you gave up ciggies in January and went straight onto vaping. Suddenly today, 4 months later, you have high bg and think it maybe due to the vaping you have been doing for 4 months.
This seems unlikely : why has vaping not caused a problem until today?
Have you discounted the usual? Stress, illness, changed you insulin batch, changed you pen/pump set, eaten something different, exercised less, drunk less...
To be honest, if my bg goes unexoectedly high for a day, I try not to draw any conclusions until I see a pattern.
Sorry I can't offer help on vaping but hope you sort your problem out soon.