While still a teenager, he joined the Ottawa Rough Riders of the Canadian Football League as a wide receiver. In 1969, Adkins was voted to the CFL All-Star team after setting a regular seasonrecord for the highest average gain per pass reception at 25.0 yards, a record that stood for twenty-eight years. He was part of both Ottawa's Grey Cup winning teams in 1968 and 1969, catching an important TD pass in the 1968 game when the Rough Riders defeated the Calgary Stampeders 24-21. Because he signed his original contract as a 19-year-old minor, he played out his option. He played three years, registering 47, 32 and 56 receptions, while averaging 10 touchdowns per season.
Adkins was selected by the Dallas Cowboys in the second round of the 1970 NFL Draft. Having star wide receivers such as Lance Alworth and Bob Hayes, the team used Adkins primarily as a punt and kick returner during his two seasons, when injuries didn't limit him. In 1970, he was placed on the injured reserve list, after playing in 5 games. In 1971, he only played in three games because of injuries and was placed on the team's taxi squad. Although he wasn't on the active roster when the Cowboys won Super Bowl VI, he still received a ring and a full share of the playoff bonuses. In 1972, he asked the Cowboys to trade him, so he was sent to the New Orleans Saints in exchange for second round draft choice.
New Orleans Saints
In 1972, he was acquired after he impressed the New Orleans Saints during a 1971 preseason game, where he had 3 receptions for 138 yards and 2 touchdowns. He led the Saints in kickoff returns with 1,020 yards and a 23.7 average, even though he played through an ankle injury. On June 5, 1973, he was traded to the New York Jets along with punterJulian Fagan and an eight-round draft choice, in exchange for quarterbackBob Davis, punter Steve O'Neal and a fourth round draft choice.
New York Jets
Injuries also hampered his 1973 season with the New York Jets. He started 5 games, posting 6 receptions for 109 yards. After he injured his knee during the 1974 offseason, Adkins was placed on injured reserve and eventually released before the start of the 1975 season.
Chicago Winds (WFL)
In 1975, he joined the Chicago Winds of the World Football League, catching 12 passes for 130 and one touchdown. The Winds folded before the season ended, finishing 1-4. Adkins was selected by the San Antonio Wings in the Chicago Winds dispersal draft, but he didn't play for the team.