I feel as if something is getting stuck in my throat always followed by production of mucus(generally in morning) for around 4 months. This is also followed by a bit of irritation in left ear(Although, it's not pain but more or less, it's a kind of irritation). I don't have any difficulty in breathing and swallowing food, neither do I have any voice change. But generally, after having food, I feel to cough and find a little difficulty in breathing. I have a history of smoking for past 4 years. I have already quit it for past 4 months.