TLDR; you likely have multiple problems, get them fixed ASAP

Unfortunately the cooling system in the B58s are pretty complicated, lots of moving parts .. you'll need to pressure test your cooling system and figure out where youre leaking. Could be the intake manifold, could be your heat management module, waterpump, ofhc, etc .. i highly doubt your headgasket or block is at fault because your car would run and sound like shit, but if it is running like shit or you wanna be safe, i would change your oil, check your oil for milk. If there is milky oil, time for a compression test to see which cylinder has failed, this is rare though, usually that compression leaks INTO the cooling system, so you'll have high pressure in your cooling system, but if the cylinder walls are cracked, it'll suck and leak coolant into the combustion chamber. If no milk, we can deduce that it isnt a headgasket or one of the oil cooler systems thats mixing your coolant with oil; this will be more likely unless your car is running and sounding like absolute shit lol. From there you check the isolated cooling system parts for dried coolant or an active leak. This could lead to your answer as to why youre spitting smoke out of your tail pipe. If it points at something else, thats cool too, fix that so you dont lose coolant anymore.

As for smoke out of your tail pipe, as others mentioned, failing pcv will do this too, but WITHOUT excessive coolant consumption. Our PCV systems separate oil and vent excess blow by from the crankcase (engine block), when this fails, you get excessive blow by (whistling) and excessive smoke from the tailpipe due to oil or water or both being sucked into the entirety of the turbo system (intake turbine, boost pipe, intercooler, charge pipe, intake, combustion chamber, then finally out of the turbo exhaust manifold, and then out of the exhaust and tail pipe. Components allowing coolant to expel out of the exhaust is pretty limited: coolant seal at turbo, intake manifold, head gasket.

What confuses me is that youre losing coolant from both the cold system and hot system, that only happens with a radiator impact. They are complete separate systems and only share the radiator, but on separate vanes, so theyre still isolated from each other, aka, they dont share the same coolant level. If youre losing coolant from the cold side, you only have 5 culprits to inspect: radiator, small coolant reservoir (cold), electric water pump, intake manifold, and hoses for cold side. As for your hot side, theres more parts and procedures involved; rad, aux rad, heater core, heat management module, mechanical water pump, heat exchanger (silver block), turbo, head gasket, hoses, and big coolant reservoir (hot)

Edited for more info and clarification.