"I'm not quitting - competition is my passion. I love kissing a trophy at the end of the week, but 20 years of playing this game at the highest level takes its toll, physically and mentally," he said.
After a woeful run from 2009-2011 where he missed more cuts than he would care to remember, Campbell returned to form in 2012 as he banked nearly $500,000 on tour. His highlight was a third-place finish at the Portugal Masters, while he also claimed a share of eighth at the season-ending Hong Kong Open.
After he finished in a tie for 30th at the BMW Masters in China in late 2012, Campbell told the Herald that he felt he was on the comeback trail after realigning with his coach.
"Inside of me, I just know that I'm not a quitter. I don't quit, simple as that. I've worked very hard and I knew it was still in there somewhere but needed to be peeled back, like an onion. There are lots of layers there and I've finally found something that's working. A combination of my coach and just everything."
Campbell's competitive nature means he may not give the game away but it's hard to see the former World Match Play Championship winner contending for titles again.