Is it ok to vape while EP?

I am currently pumping 4-5x a day. I ensure there are at least 3 hours gap between my last drag of vape and pumping (around 4-5 drags at a time). I read that it is ok and that benefits of breastmilk outweigh any possible negative effects but I want to know how much of negative impact it has. I am not addicted but enjoy the breaks and relaxation.