A cheap but effective smoke screen can be made as follows: First drill a hole into the exhaust manifold of your car, and weld the nozzle of a small plant sprayer over it. A gas line is then run from the nozzle to a pump and container containing castor oil inside the vehicle. Clouds of smoke are produced by pumping the castor oil onto the hot exhaust manifold.

(1) Speed at around 25-30 mph.

(2) Get off the gas and crank the steering wheel to the left ¼ to ½ of a full turn. At the exact same time, hit the emergency brake hard. Those of you with manual transmissions will have to depress the clutch, also.

(3) When your vehicle is at approximately 90 degrees, release the emergency brake, step on the gas, and straighten out the steering wheel. If you have a manual transmission, you will have to let the clutch back out as you are hitting the gas.

(4) Get out of the area fast.

The "Caccolube" was a simple but effective device to disable an enemy vehicle. It was a condom filled with abrasive powders and crushed walnuts, and was dropped into an engine crankcase. "After the engine heats up," the OSS manual explained, "the hot oil will deteriorate the rubber sac and free the compound into the lubricating system.
"When circulated through this system, the compound fuses and welds the moving metal parts of the machinery. Slipped into a truck, the Caccolube takes effect after the truck has been driven from 30 to 50 miles. It reacts so thoroughly on pistons, cylinder walls and bearing journals that the vehicle is not only thrown out of service but the engine is destroyed beyond repair."
This lethal "lube job" replaced the original effort using sugar, when it was discovered that sugar actually promoted better engine performance in the vehicles of that era.
Source: Jack Anderson, "Rare arsenal used by spies," Santa Cruz Sentinel, Mar 9, 1987.

"I trust him with my life driving the tractor. He can hold it on a hill and keep it from slowing down. You should see him holding that wheel as he skirts the hill and I work behind.

We take it in turns to drive and toss off the hay to the sheep and cattle."