On December 14, 2007, Smith was traded to the Oakland Athletics along with Carlos González, Brett Anderson, Aaron Cunningham, Dana Eveland, and Chris Carter for Dan Haren and Connor Robertson. Smith made his first major league start on April 9,, pitching six innings and allowing two earned runs, and earned a no decision. In the 2008 season, he led the majors in pickoffs with 15, tying the Major League record since the stat was first tracked in 1987. Smith would wind up finishing the season with a 7-16 record in 32 starts for the A's. He threw 190.1 innings while throwing 2 complete games.
Colorado Rockies
On November 12, 2008, Smith was traded with Huston Street and Carlos González to the Colorado Rockies for Matt Holliday. Smith missed the first half of the season due to injury and never made it to the major league club during the year. He only pitched in 11 games between A ball and AAA in the Rockies system. In 2010, Smith made it to the club out of spring training. He recorded his first win as a Rocky against the Mets on April 14, pitching 7 innings of 2 run ball. He also drove in 2 runs. Smith would make 6 more starts for the Rockies before being demoted to Triple A. Smith wound up finishing with a record of 1-2 with an ERA of 6.23 in 39 innings. He also issued 24 walks with 31 strikeouts. On April 4, 2011, following spring training, Smith was officially released by the Colorado Rockies organization.
He signed a minor league contract with the New York Yankees on June 13, 2011. He was assigned to the Triple-A Scranton/Wilkes-Barre Yankees. He was released by the Yankees after posting an ERA of 4.84 in 13 games.
Smith signed with the Boston Red Sox, and was assigned to the Triple-A Pawtucket Red Sox. Between the Yankees and Red Sox Triple A system, Smith compiled a 5-4 record with a 4.52 ERA in 17 games.
Smith signed a minor league contract with the Los Angeles Angels of Anaheim on February 3, 2012. Despite posting an 11-11 record and having better control throughout the season, Smith never got called up by the Angels.
On December 11, 2012, the Toronto Blue Jays announced that Smith had been signed to a minor league contract. Smith never reported to the Blue Jays AAA system Buffalo Bisons.
On May 6, 2013, the Philadelphia Phillies announced that Smith signed to a minor league contract. Smith was moved to the bullpen for the first time in his career. On July 26, Smith threw a season high 101 pitches en route to a win. He improved his record to 5-1 in AAA. Smith won July Honors for the Valley Pigs, going 3-0 with a 1.06 ERA in 5 starts improving his record to 7-2 for the Phillies Triple-A system. He finished the season 8-4 with a 3.31 ERA in 23 games for the Iron Pigs.
On November 7, 2014, Smith signed a minor league deal with the Atlanta Braves. They assigned him to the Gwinnett Braves. For the 5th season in a row, spent the majority of the season in AAA, alternating between starting and relieving. In 31 games, including 19 starts, Smith posted an ERA of 2.71 while going 6-7.
Smith is a changeup specialist, relying more on off speed pitches and deception rather than velocity. His fastball tops out between 86-88 MPH and he also throws a curveball. One knock on Smith throughout his career has been the walks per nine innings, as he has amassed more than four walks per nine innings.
