HN user
Most CBD oil is decarboxylated for a variety of reasons, both market driven and regulation driven. That being said, all CBD oil should have a COA with it (certificate of analysis). Read the COA to determine exactly how much CBDA, CBD, and other cannabinoids are present.
Unfortunately, no.
Quick primer on cannabinoids. The plants don't produce THC, CBD, etc... they produce THCA, CBDA, etc. This -A form, called the acid form, has a carboxyl group attached to it which changes how the cannabinoids interact with your body.
Heat, even temperatures as low as 250F / 120C can de-carboxylate the cannabinoid, yielding THC from THCA, and CBD from CBDA. When you smoke weed, the act of smoking is decarboxylating the weed as you consume it. Same as when you make pot brownies - the cooking of the brownie "activates" the THC.
This research, however, shows that it is precisely the acid forms that block cellular entry. So THCA and CBDA are good, but THC and CBD have not been shown to be as effective.
Long comment short: don't smoke weed, instead make a room-temp tincture with it. It won't get you stoned, but it might help stop covid.