has a Nicotine Warning label on the outside, then why don't Nicoderm CQ patches and other NRTs have a one?
Those are FDA approved smoking cessation products. They took the even more arduous drug pathway though the FDA.
Why do we have a PMTA process as crazy as this when BT products do not?
New BT products must go through exactly the same process, unless they have a grandfathered "predicate" product to which they are "substantially equivalent", in which case an SE application must still be filed, which details the exact changes from the predicate product. Unfortunately, it looks like there are no grandfathered vape products available to use as predicates. The FDA claims there is one, but won't divulge what it is.
If our PMTA approval process costs so much, takes so long, and is so hard to actually get an approval for (if at all), then why was Philip Morris' iQOS passed through so quickly?
It took more that two years for the IQOS PMTA to be approved. I would hardly call that "quick".
Why don't Legal E-Cannabis products have to go through this same kind of PMTA?
Because those are cannabis products, not tobacco products. Cannabis is still an illegal, Schedule 1 drug at the federal level. The Tobacco Control Act requires the FDA to regulate tobacco products. Nothing in federal law gives the FDA the power to regulate any cannabis product.
However, if they ban our e-cig flavors, then and a new Black Market will show up quickly for that! Ban all e-cig Hardware and premade Juices, and Nothing will be regulated or made safely to any degree anymore, as the Black Market supplies this as well.
Absolutely correct, as is the rest of your post.