The idiomatic expression "to drugs" means to use or consume drugs, typically illicitly. It can also refer to being under the influence of drugs, which may impair one's judgment and behavior.
Both papers lead with the story of drug use in baseball. (newscientist.com)
I actually read a study where minute particles of drugs used for euthanasia were found in commercial dog food. (fidoseofreality.com)
The contract calls for drug testing for employees when deemed appropriate during work, a change from the previous policy, which required that only new employees be tested. (articles.chicagotribune.com)