If you're talking about an MES Gen #1, you probably aren't getting much smoke because the bottom of the chip drawer is too far from the element, or there's an extra piece of metal between the drawer & the element. If that's your problem, you may still be able to get the FREE retro-fix chip burner from Masterbuilt, but the best way to fix it would be to get an AMNPS, and start really having fun smoking.
I have found my smoker produces good smoke with the vent opened about 3/4. I am finding however that at temperatures below 250 F not much smoke is produced.
Bear