I love the smell of diesel exhaust in a properly running diesel. Rolling coal is nothing but wasted fuel due to over fueling, improper injection timing and improper boost levels. All abuse the engine. Kids do stupid things. I just sold my recent diesel and went gas. The DEF injection made the exhaust disgusting smelling. Everything the EPA mandates for modern diesels significantly shortens their useful life. Diesel exhaust use to be so coarse that it basically fell to the ground a few feet away and fertilized it. The particulate is basically nano particle sized now and floats in the air for days. I'm sure there are no health hazards from that. Good work EPA.
A properly tuned diesel doing hard work is a magnificent thing to witness.