We tend to forget that even presidents, politicians are humans. And we judge them if they admit to committing average human errors. Out of the people surveyed regarding this, 42% accepted to the usage of marijuana and 16% to cocaine.
Some of the notable politicians who admitted to drug use are Michael Bloomberg who admitted about using marijuana during 2001 campaign for Mayor. Former Presidents George W. Bush, Bill Clinton and current President Barack Obama have all tried drugs.
Even Supreme Court Judge Clarence Thomas admitted to using drugs. The reason behind many politicians coming forward about drug use is that they think saying no will create a suspicion that they are hiding something.