Does Richard Thomas
Breath out of a tail pipe from a car, or a Truck in this flick?
You Have a Hard Lip, Herbert..
Better Living Thru Chemistry
Yes, at one point, "Through a window, Kyle [son of the lead character played by Scott Bakula] sees Jerry [Richard Thomas character, his stepfather, an alien] inhaling carbon monoxide fumes from the exhaust of a tow truck."
See my summary of the mini-series:
http://www.mjq.net/invaders/miniseries.htm