Diego Maradona: "In Barcelona, I made my biggest mistake". The legend Diego Maradona made serious revelations concerning his addiction to drugs. "This happened in Barcelona when I was 24. I made the biggest mistake of my whole life. The drugs are a big problem, they kill you. I feel lucky that I can talk about it now. If I had continued using such stuff I wouldn't be alive," claims Diego Maradona. "For already 13 years I am clean, and I feel wonderful," Maradona told.