This is a common question for people who are considering giving up their gas grill and going to the pellet grill. Pellet grills are more environmentally friendly, more efficient, and more versatile than gas grills.
Pellet grills produce a lot of smoke because they burn wood at high temperatures, which is what gives them their flavor profile. While it is safe to use a pellet smoker in your garage with the door open and with perfect ventilation, and a carbon monoxide detector, there are still some risks involved. For this reason, I don’t recommend using a pellet grill in the garage.