From what I have seen and heard the effects of ecigs on lung capacity are minimum at best I have seen plenty of post from here of long term smokers who have had significantly reduced lung function whereas swapping to ecigarettes has shown a dramatic ( no mention of full capacity but that could be because some damage is in fact irripairable ) this study appears to be very vague on it's sources and the controlling measures and precautions taken to achieve the results ecigs are are not like ciggaretes in a limitless amount of ways for example no two ejuice suppliers will sell exactly the same juice the variables for what juice alone are through the roof differant flavours pg vg concentrations nicotine concentrations or what brand of ecigarette was even used I find it highly unlikely that the product used for this study was selected in the same manner that actual vapers select there product go example I highly doubt that this product was a provari / lavatube ect with home made or on order made juice like I'm sure the majority of long term vapors will use ( that point was more about the juice not the device to deliver it ) I find it highly likely that the device used was a typical imitation cigarette style ecig which are made cheaply with cheap refills made for profit not performance I have seen studies conducted which state that the varies of nicotine in these devices are not consistent and I believe them and that is not including the dilutants used in these devices which is safe to assume are also as inconsistent this is a typical case of scare mongering with no real evidence to back up the claims being made