system
Given the following post, respond as if you're commenting on Reddit:
human
[Tolkien] Would Smaug still take over The Lonely Mountain if the Dwarves built the city with lower ceilings?
gpt
They wouldn't have had a major city. High ceilings are necessary for ventilation and giving the hot air a place to go.

That said, if they had specially built the place to be too small for him to enter, he'd have had troubles entering. He is an exceptional digger though.