Smith will be able to apply for reinstatement in September, 60 days before the year is up. This is not his first suspension, as he was banned nine games in 2014 after spending time in rehab for the same issue in 2013.
His former team, the San Francisco 49ers, got fed up with his antics, cutting the defensive star during training camp last summer, after his fifth arrest since coming into the league.
The 26-year-old would go on to sign with Oakland, and recorded just 3.5 sacks in nine games, which included seven starts. In 59 career games, Smith has 47.5 sacks over five seasons.
The team is not done adding to their defense, as they have also signed cornerback Sean Smith. When the former Niner returns, he will join Khalil Mack and Bruce Irvin on the pass-rush. Bengals free-agent safety Reggie Nelson is scheduled to meet with Oakland this week, as the team hopes to have Smith returning to a high-powered defensive attack.