Starting young!

One day an old man saw a young boy walking and smoking a cigarette.
He stopped the boy and asked how old he was.
The boy replied "I'm 6 years old"
"Since when do you smoke?" the old man asked.
"Since I first slept with a woman" said the boy.
"And when was that?" asked the old man.
The boy answered: "I can't remember, I was drunk."