95 astro van runs rough and blows black smoke?
The black smoke is usually unburned fuel from the vehicle running too rich. If the check engine light is on you can pull the codes which will give you guidance. O2 sensors are common as well as a variety of ignition & other sensors. Test components before replacing, you can spend a lot of money guessing and throwing parts at the vehicle.
94 Suzuki sidekick 1.8l engine has a rough idel stalls when put in gear and blows out black smoke from exhaust that smells like gas?
Black and Milds are typically smoked as cigars, meaning that the user does not typically inhale the smoke, but rather "puffs" on it (draws smoke into mouth and then blows out, without breathing into lungs). However, if you smoke Black and Milds and inhale the smoke, they are actually much worse than cigarettes due to the increased tar and nicotine within.