According to the book The Hobbit by J.R.R. Tolkien:
Smaug asks, "Who are you and where do you come from, may I ask?"
Bilbo answered, "You may indeed! I come from under the hill, and under the hills and over the hills my paths led. And through the air, I am he that walks unseen. I am the clue-finder, the web-cutter, the stinging fly. I was chosen for the lucky number. I am he that buries his friends alive and drowns them and draws them alive again from the water. I came from the end of a bag, but no bag went over me. I am the friend of bears and the guest of eagles. I am Ringwinner and Luckwearer; and I am Barrel-rider."
'I come from under the hill, and under the hills and over the hills my paths led. And through the air. I am he that walks unseen. I am the clue-finder, the web-cutter, the stinging fly. I was chosen for the lucky number. I am he that buries his friends alive and drowns them and draws them alive again from the water. I came from the end of bag, but no bag went over me. I am the friend of bears and the guest of eagles. I am Ring-winner and Luckwearer; and I am Barrel-rider.'
Smaug doesn't recognize the scent of Hobbit, although he knows what dwarves and men smell like.
Bilbo told Smaug a riddle to keep him distracted.
Smaug tells Bilbo not to trust dwarves:In return for the excellent meal [of the Company's ponies] I will give you one piece of advice for your good: don't have more to do with dwarves than you can help!Smaug-The Hobbit: "Inside Information"
Clue finder is one of the names that the invisible Bilbo Baggins uses when he boasts to Smaug the dragon.
His sense of smell. It is one of the main reasons why Gandalf chooses Bilbo as the 14th member of the Company (because while Smaug would be familiar with the smell of Dwarf, the smell of Hobbit "would be all but unknown to him").
Bilbo Baggins
Smaug doesn't recognize the scent of Hobbit, although he knows what dwarves and men smell like.
Smaug has never smelled anything like Bilbo and he cannot place it.
In the beginning it was Smaug , then in the end of The Hobbit , Bilbo gains it
Smaug is the major conflict who is slain by Bard.
The Hobbit is fairly linear. There are a few places where the time line backs up, particularly when the dwarves and Bilbo are exploring Smaug's den and Smaug is attacking Laketown.
Bilbo told Smaug a riddle to keep him distracted.
He saw a small bare patch. That bit of information is what led to Smaug's death.
It was his smell. Smaug had never encountered a hobbit before. He did not recognize the smell of him, but could tell that he had been with the dwarves.
No, he makes it back home. After all, he does have a part to play in The Lord of the Rings.
Bilbo, Thorin, Smaug, Gandalf, Precious, the dwarves
By 'the hobbit', I'm supposing you mean Bilbo Baggins in The Hobbit? If so, he faced Smaug the Great Dragon, King of the Lonely Mountain.