Drugs are and have been a big problem in sports, whether it be performance-enhancing or things such as marijuana, heroin, cocaine and so on. They are everywhere and it is ruining great careers in many sports.
One of the most notable drafts in all sports is the 1986 NBA Draft. It wasn't admired because it had many great players, but because four of the top seven players used drugs heavily (You will read about those players shortly).
So, with that being said, here are the top10 NBA careers that have been ruined by excessive drug and/or alcohol use.
NOTE: I did not put David Thompson or Shawn Kemp on this list because their careers were rather decent. Thompson, a former Nugget, was inducted into the NBA Hall of Fame in 1996 and Kemp was one of the most prolific dunkers of all-time, including being one of the best big men of the early-to-mid-1990's.