Hiya,
I watched that program. The bit you are referring to is the results of Micheal vaping for a month. He is a non smoker and never smoked in his life. Obviously, if you are a non smoker you shouldn't take up vaping as there will always be some adverse effects in the lungs. Despite his results showing a decrease in function it was stated to him that it will clear up in no time at all. There also wasn't a comparison to a smoker for this test. Smoking probably is far higher than the 4x that the Doc stated but without any stats it's difficult to say.
During the program a group of 32 individuals were also given tests. One group continued to smoke. Another went cold turkey whilst another on NRT and the last on e-cigs. If you watch it from 48 mins you will see the results for Carbon Monoxide, Acrolein - a carcinogenic, and Nicotine levels in the body. They were all greatly improved in the 3 groups that stopped smoking whatever the method. There was also great improvement in heart function and elasticity. All the results were virtually identical to those of non smokers.
The only test that revealed 'something' was the airway resistance test. However, they didn't show the results for this for some strange reason. I believe it was because there was a reduction but not as much as the Cold Turkey or NRT group. He said they'll continue to investigate and I've also heard him saying, on another program, that they're continuing to monitor all the individuals so I expect a follow up program sometime.
In short. If you smoke. Vaping is very good as a harm reduction and eventually reducing to complete non dependence of the ritual. Obviously,If you don't smoke don't vape.
For those that can't access the program here are a couple of graphs of the results:
Carbon Monoxide:
Acrolein:
Nicotine: