My wife had some surgery recently, and we all know one of the unpleasant effects of the pain killers are constipation. So, to get things moving again I purchased, doctor recommended, MiraLAX. The only active ingredient is polyethylene glycol. Now, it has the #3350 to the side. So I guess that is the molecular weight, as opposed to 400 in e-liquid. It was just an interesting observation I thought I would pass along.