system
Given the following post, respond as if you're commenting on Reddit:
human
[Lord of The Rings] What was Smaug doing up north before he came down to conquer Lonely Mountain?

Did he have a hoard up there? Why was he there?
gpt
> Did he have a hoard up there?

Most likely. When the Dwarves migrated to the Grey Mountains, the Dragons weren't too happy with that and fought them for years. Eventually, the Dwarves admitted defeat and most of them left the Grey Mountains. You can assume they left behind numerous treasures and abandoned multiple holds which some of the Dragons would've taken possession of. Considering Smaug was the last of the great Dragons, it's highly likely that he was alive back then as well. 

> Why was he there?

Because that's where most of the Dragons lived following Morgoth's defeat. There was a large valley in the Grey Mountains called the Withered Heath, which was basically a breeding ground for Dragons.  One could assume that Smaug was born up there, hence why he lived up there.