Trailing 20-7 at halftime, the Jaguars closed to 23-20 early in the fourth quarter on Maurice Mayo's 5-yard TD run, but Smith hit Adrian Hardy on an 8-yard pass on the next Bulldog possession for a 30-20 lead.
Dancy gained 144 yards on 15 carries while Smith was 19 of 29 for 209 yards passing with three interceptions.
Under first-year coach Steve Campbell, the Jaguars were outgained 264 total yards to 98 in the first half, but finished with 308 to Louisiana Tech's 440.
Garvin was 7 of 16 for 47 yards passing. Baker also scored on 4-yard run.
Duke dodged trouble in the short term when its starting quarterback went down.
The No. 18 Texas Longhorns travel to Kansas State Saturday with one thing on their minds: change. That idea sounds pretty good to Kansas State right now as well.
The schedule forces Michigan State to take a step back this week. If the Spartans want to remain in the rankings, they can't afford to take an even bigger step back.
South Carolina will be the next team to see if it can stop or at least slow Kentucky running back Benny Snell when the Gamecocks and Wildcats clash Saturday in Lexington, Ky.
Florida coach Dan Mullen understands he may get less than a welcoming reception when the Gators visit No. 23 Mississippi State on Saturday.
Two top-10 teams have not squared off at Notre Dame Stadium since 2005.