Jigging is more popular for walleye, but many walleye anglers will also catch a lot of smallmouth bass while jigging.  When smallmouth bass go deeper, find some good structure and try vertical jigging to catch some smallmouth bass.  Live bait such as minnows, nightcrawlers and leeches work great on a jighead.  You can jig many different soft plastics baits also, but some of the better baits to use are minnows with a twitch tail and finesse-style worms.