Stimulants, in the form of caffeine (coffee and tea). These drugs can produce the desired wakefulness, alertness and sense of well-being, but can also produce cardiac arrhythmias, tremors, insomnia, as well as withdrawal symptoms for some people.
The second most widely abused group of drugs are the nicotine containing substances - cigarettes, cigars, and chewing tobacco.
The most widely used illegal drug is marijuana (except where it can be obtained legally, for medical purposes, in nearly a third of the states of the United States).
Believe it or not, the second most commonly abused drug is nicotine. The first most abused drug is Caffeine.
advil/ibeprofin.
Alcohol is the oldest drug known to man, and also the most widely-used drug. So, I would imagine it is the most widely-abused drug, as well.
Alcohol Marijuana is the most abused illicit drug in the United states army
Alcohol.
Alcohol
Marijuana.
alcohol
cocaine
oxycontin
Sugar
By a substantial margin, alcohol is the most widely abused drug in every age group—including children. However, marijuana is the most widely used illicit substance among all age groups, but “club” drug use is increasing.
Marijuana (weed).
pain pills or marijuana