Michael Phelps behavior "regrettable"

We watched Michael Phelps make history at the 2008 Beijing Games. It seemed as though we knew everything about Phelps, from his eating and training habits to what's on his iPod.

Phelps' performance inspired many people. Some of those people are disappointed to see this photo. While he did not exactly acknowledge using marijuana in the picture, Phelps called his behavior "regrettable."

He basically said, I am a 23 year old kid and I acted like one. The picture was taken 3 months after the Olympics.

Phelps has never tested positive for banned substances and even subjected himself to extra testing before the games.

So, has this one picture tarnished Phelps' reputation forever or will we forget by the time Phelps gets to London in 2012?