Smoke Control on My O Gauge Engines

I recently had a problem with the MTH NS Heritage SD70ACe. It was the same problem as I said in my Youtube video on this engine. So 3 days ago, I took it to an MTH dealer for a repair. I was also worried about the smoke control on the engine, because the smoke unit couldn't turn off when using my DCS Remote Commander Set, which came from an MTH ready-to-run set. When the engine was fixed, I decided to run it with smoke. As a result, I tested smoke with all my other engines that have a smoke unit. And they do work with the smoke control turned on. Luckily, I wasn't hurt from the smoke. I originally didn't like the smoke, but I thought it's good to run my engines with smoke.