In the end people in some places in the world will need some form of protection against supply problems. Who knows exactly where this applies, we won't have any hard facts for a couple of years.
Here is a way to protect yourself from supply issues. I've lived off-grid a lot so these solutions are practical. Unflavoured nicotine base (anywhere from 100mg upwards) will probably keep 10 years in a freezer. In theory PG base keeps longer than VG base, but we don't have enough time with these issues yet to be sure. Re-bottle the liquid into glass containers, cobalt glass is best, though it probably doesn't matter much at -20C. Treble-pack the bottles: inside ziplock bags, inside plastic boxes.
1. If you expect a nicotine supply problem and no more than 2 or 3 days electricity supply interruption at any one time.
Get a small and efficient freezer that goes down at least to -20 degrees C. The lower the better. Small internal volume is best, so an under-counter freezer is the largest you should consider. Place it in the coolest part of your residence in the summer months; but if that place (say for example your garage or shed) is near or below freezing in winter, you may have to move the freezer somewhere warmer in winter: freezers don't work properly if the room temperature is too low as there is not enough temperature differential for them to work well, the rear heat disperser grid can freeze up.
Get several freezer packs (camping ice packs) and place in the freezer, this provides cold inertia to keep the contents colder for longer if the power is cut. Get a freezer thermometer.
If you want to do the job properly, get some 4-inch building insulation foam with the foil side. Cover the freezer with the 4" foam blocks, with the foil side out, and use spray can foam to glue up the joints with. You can't do the back, but you can do the top, sides and door. If you get 2" board that's OK, use two layers, it also allows you to use a stepped door system which is the best of all.
Get a small generator to provide power, you'll need 1 kW. You can use a Honda type suitcase genny that runs on petrol (gasoline), or better, have it converted to propane (not butane or mix). Keep in mind you can't store petrol, it goes off, and anyway you don't want it around the house. Large propane bottles are much better for this size of solution.
You can run the genny 2 hours or so a day to bring the freezer temp down, the freezer blocks will keep the cold reserve banked for several hours. Run tests on this with the thermometer and write the results down - obviously you don't want to be opening the freezer to check the temp if you are without power.
2. If you expect a nicotine supply problem and no more than 2 weeks electricity supply interruption at any one time.
As above but you'll need a small diesel generator. Diesel is your friend, you can store it for years without a problem as it's an oil not a spirit like petrol (gasoline).
3. If you expect a nicotine supply problem and weeks or even months of electricity supply interruption.
This is the long-range boater's solution as it's what they plan and build for.
As (2) above, but you'll need green power generation to avoid burning fuel except for emergency use. On long range sailboats we use towed turbines, solar panels and wind generators, with the diesel engine for backup. Obviously a towed turbine is out, which is a shame as mine pumps out 5 amps 24/7 if I'm moving

Your system is based on a giant 12 volt battery bank and an inverter, with solar panels and a wind turbine feeding the
batteries. You pump 12v at 5 or 10 amps into the battery bank, then get mains power out of the inverter when you need it.
protip 1: have 2 battery banks and switch them in or out as needed. A 'bank' is 2 or more high-quality
batteries connected
in parallel (not in series!).
protip 2: physically remove both the neg and pos connections from any battery bank out of use and charged (not just by using switches on the connections), as otherwise they discharge even with no circuit connected. Just remember to reconnect before charging...
This way you can live off-grid for months with no problem. Nicotine shortages and power outages will pass you by.
4. Ultimate solution.
As above in (3) - but build your own freezer using marine freezer components and 6-inch foam. Danfoss systems are good. Forget the grid, you won't need it.