Bill Smith puts one foot in front of the other and takes it one day at a time. He knew he wasn’t going to let his blindness define him.

“My goal right now: I want to do the Boston Marathon,” Smith said.

When he’s out on the trail, Bill has the help of his guide runners Rebecca and Kevin, and his guide dog Quidditch, his second guide dog from Guiding Eyes for the Blind.

“There's a lot of trust that goes into being with a guide runner, whereas Quiddy gives him something more to hold on to,” said Rebecca Chapman, a guide runner.

For most people, running is a way to stay in shape, but for Smith, it’s much more.

“Sobriety for me right now is a wonderful thing. I thought I'll never, ever get to this point,” Smith said.

After years of alcoholism, Bill has a new kind of addiction.

”It's the same thing with alcohol for myself. You get that high. You want to keep on going. For me, now is my running. The endorphins inside keep me high all day,” Smith said.

Smith says his path to recovery is a different type of marathon, and while he’s working on himself, he’s also helping others as a peer advocate at New Choices Recovery Center.

“I want to help people," he said. "I'm going on 10 years in sobriety, and if I can stay sober, being blind and being an alcoholic, I'm pretty sure I can help somebody out there.”

Smith has a GoFundMe underway to raise thousands of dollars to achieve his dream of running the Boston Marathon.