The only times I have had shortness of breath while vaping has been with some of the stronger flavors, such as clove and today when I got my order with the WOW vanilla, though it didn't last for too long, but it probably will each time i first vape it in the mornings. (at least that's been my experience) I think it may have something to do with the MG amount, though I am not positive on that.
I know when I went down to a lower MG in the clove flavor I did not have the shortness of breath anytime i vaped it.
I know when I went down to a lower MG in the clove flavor I did not have the shortness of breath anytime i vaped it.