When you smoke cigarettes, youre placing more toxins in your body than it can handle at any one time. Often times, the body will simply store those toxins to deal with later. It encloses them in fat. When we start vaping the body now has time to deal with the toxins and starts to break down some fat to get to them.
A friend told me that about six months into vaping he felt good enough again to start working out. As he worked out some of the fat he had aquired he went through the detox of cigarettes all over again as his body was assaulted by all the cigarette toxins it has stored up.
I had a similar experience. So, I'm guessing this is true. I started working out two months ago so that I could be ready for my upcoming surgery, and I started to go through withdrawals again. It was nothing the PV couldn't handle, but still, it was not the best cup of tea. I just make sure to carry the stronger juice with me when I go to the gym now!