The way to dispel the toxic smoke in Baldur's Gate 3 is to find a ventilation duct behind the hag, and then the smoke can be discharged through the ventilation duct, and then it will be easier to successfully complete subsequent tasks.
Answer: Find the ventilation duct after getting close to the hag, and use the ventilation duct to disperse it.
This situation will be encountered when the player is doing the hag mission. If the player passes through the smoke, he will lose a certain amount of health.
So first, you can block the smoke. After finding the hag, find the ventilation duct behind him and throw something to suppress the air outlet.
Be careful not to throw anything that is flammable, as this may ignite the smoke. Use this method to disperse the smoke.
In this way, you can better complete the following tasks. After completion, you can get the corresponding rewards. The rewards are quite rich.