Miller was handed a six-match ban for violating the league's substance abuse policy and is now in stage three of the NFL program, which means that he is subject to up to 10 unannounced drug tests a month.
"I definitely made mistakes in the past," the 24-year-old told reporters. "It wouldn't do anybody any good to go back and defend that stuff. I served my suspension, I'm working hard to gain everybody's trust back. I'm just going to take it one day at a time. All I can ask is that everybody judge me on my actions going forward. And I can gain everybody's trust back that way.
"Like I said, all I can do is take it one day at a time, one play at a time and gain everybody's trust back like that. I can't sit here and say 'this is never going to happen' or 'I'm never going to do this'. I'd be lying. I just got to take it one day at a time and gain everybody's trust back.
"I definitely made mistakes, but I'm working hard to fix those mistakes. I can't, you know, relish on the past or anything, but I can sit here and say I'm working hard to be a better person, to be a better football player, to be a better teammate."
Miller is in line to make his return to the starting lineup against the Indianapolis Colts on Sunday as the Broncos look to maintain their 100% record so far this season.