Hi, My Name Is Venkatesh. While Spitting I Could See

Hi, My name is Venkatesh. While spitting i could see some blood along with that. This is not happening for the first time. I used to smoke. But i stopped it before 2 years. While smoking i got twice. After stopping, for the first 1 years i don't have any problem. In the past 6 months i got blood twice. What could be the reason? I always don't have my breakfast in the morning. Please help