Do power tools and pot smoking mix well?

The apartment below me is being completely renovated, including removing and changing some of the walls. That means real power tools like circular saws and stuff. The guys who are doing the work are pot smokers. Really. When MA leaves for work in the morning, it's wake and bake time for them - the building's hallways are filled with pot smoke. Today, amidst the sawing noises, I walked into the other room and smelled pot smoke in my unit. Seems like these guys are smoking pot while using a circular saw. I have nothing against smoking pot, but that just seems like a bad idea, kind of like drinking and driving a boat around at night - just bound to end in disaster. I will not be surprised when the ambulance comes to pick up the guy who sawed his arm off accidentally.