It's the MAOI's in cigarettes that give you that relaxed feeling. Nicotine is actually a stimulate. Since you don't get the MAOI's when you vape that's probably why.
Finally, after reading through this whole thread, someone has hit the nail on the head!!! Maybe a bit of what everyone has said is true, but to attribute it all to lack of wanting is not fair!!! I and many others have no lack of wanting to get off cigs, believe me! I could not want it more! But for some of us, nicotine alone is NOT ENOUGH!!! It is the Whole Tobacco Alkaloids in tobacco that we are missing, because it is not in our e-cig fluids. Recently, there has been a few vendors on this forum that have started to sell fluids with all the alkaloids in them, and they cannot keep them in stock, they are flying out the doors, so it isn't some small minority that feels this way, there are a lot of us! And before anyone protests about anyone "adding stuff to their e-juice" not to worry, this is only for the ones who need it, and only at extra cost! And for the record, using nicotine alone is relatively new, as in nicotine replacement therapy, but the normal profile of what we smoke(d) is different and contains the other components of tobacco that act synergistically with nicotine's stimulant properties to create that satisfying relaxation component of smoking, the creation of the MAOI's mentioned above! As much as I LOVE vaping, I still CRAVE that component in cigarettes that I don't get from ordinary e-liquids, even at a high mg level! Not even while chain vaping. A dear new friend from the forum educated me about Swedish Snus, a tobacco product with the full complement of WTA's, and actually sent me some to try! How awesome is that? There is a forum here for Snus users or the curious so I won't go into detail except to say it is a little packet of flavored tobacco that you place between cheek and gum (and you DON'T spit! LOL) and that satisfies those "other" cravings! To me it was proof that nicotine alone is not enough for all of us! Maybe most, but NOT all. I WILL be trying the WTA fluids if and when I can procure some!!! I am not saying that this is also your hubby and mom's problem with their vaping experience, just that you and anyone else who is reading takes it into consideration before assuming that a negative attitude alone is the cause of their dissatisfaction. There are so many aspects of vaping that make the whole experience different for each and everyone of us, but I agree with those who say you cannot force anyone to make the switch! If anything, nagging just makes some people MORE resistant to trying. The best you can do is be supportive and informed. Saying to a loved one, "I don't want to nag, I just want for you to be able to enjoy this as much as I have, and be with me for a long time to come", or something similar, lets them off the hook and also lets them know why you are persistent about it. As I said, there are so many variables it is difficult to pinpoint why someone feels dissatisfied with their PV, but that is why this forum is such a blessing! Keep up the good work everyone, we are all in this together!!!