Position an oven rack in the center of the oven and preheat to 350 degrees F. Spray a baking sheet with vegetable oil cooking spray.
Put the chickpeas on a clean kitchen towel or several paper towels and dry thoroughly. In a medium bowl, toss the chickpeas with olive oil to coat. Sprinkle with the smoked salt and toss again. Transfer in an even layer to the prepared baking sheet.
Bake, shaking the pan halfway through the baking time, until the chickpeas are crunchy, 50 minutes to 1 hour. Let cool at least 1 hour; the chickpeas will become crunchier as they cool. These are best eaten within 1 day.