The people of Pompeii did not actively use the smoke rising from Mount Vesuvius. While they were aware of the volcano's existence and its potential danger, they did not utilize the smoke in any practical way.

Here's why:

* The smoke wasn't necessarily useful. The smoke from Vesuvius wasn't a consistent or controlled source of anything useful, like heat or energy.

* Volcanic smoke is harmful. The smoke and gases released by Vesuvius were likely toxic and harmful to inhale.

* Pompeii was a thriving Roman city. The people of Pompeii were more focused on everyday life, commerce, and social activities, not on using volcanic emissions.

However, it's important to note:

* The people of Pompeii did notice the volcano's activity. The residents were aware of the volcano's potential danger, as evidenced by the presence of a temple dedicated to Vulcan, the Roman god of fire and volcanoes.

* The eruption was a devastating event. The eruption of Mount Vesuvius in 79 AD buried Pompeii under volcanic ash, destroying the city and killing thousands of people.

Therefore, while the people of Pompeii were familiar with Mount Vesuvius, they didn't actively utilize the smoke for any practical purpose.