you can get mouth infections gives bad breath andwhen burps it smells like egg and tastes like bad egg
I know, it's horrible!
Sounds weird, but have you tried switching things like mouthwash, toothpastes?
Taking Zinc might make the "normal" taste in your mouth come back. Some medications also cause a nasty bitter taste. Before you eat, try rinsing your mouth with baking soda or epsom salts. Epsom salts taste bitter - but they leave your mouth tasting sweet - as does baking soda. Zinc can heal those taste buds that have been exposed to so much hot air/smoke all this time.