Clearly you haven't seen "Short Circuit 2."

Throughout the show, whenever Kim or Jimmy smokes, they are being honest with their own self, their reality and their emotions. It's a juxtaposition to alcohol and when Kim or Jimmy drink, they are lying in some form or fashion. Also, the characters use of coffee equates to hard work. Smoking=Truth. Alcohol=Lying.…

I assume the sound of the air ratchet guns and Mike's knowing look means that the drug supply is in the truck's tires. So, Mike's spike strip is intended to cut the tires and leave a breadcrumb trail of drugs on the road for the soon-to-be-tipped off authorities to follow to bust up the whole operation.