My personal suspicion is atheists and agnostics being more prone towards drug and substance abuse in contrast to theists.
Whatever negative toll drug abuse is having on society, it is likely hitting atheists and agnostics the hardest.
Drug Use among Christians
"The Huffington Post reported on the results of an unscientific poll of 1,012 drug users, sorted by the different spectrum of religious belief covering practicing Christian, agnostic, and atheist. The results of the survey had
95 percent of self-reporting Protestants and Catholics admitting to smoking marijuana, more than the 94 percent of atheists who did so. Harder drugs like cocaine were used by only
30 percent of Christians, and 30 percent of Protestants and a slightly smaller amount of Catholics said they used prescription stimulants, narcotics, psychedelics, and hallucinogens recreationally.
As many as
75 percent of the Catholics and Protestants who admitted to drug use agreed with the statement that “drug-induced spiritual experiences can be positive for individuals,” and that experiencing a high had spiritual value. Some people admitted to buying drugs at their church. Under 20 percent of Catholics, and more than 15 percent of Protestants, admitted to attending church services while under the effects of cannabis. This suggests that despite the potentially protective effect of religious belief, “the grip of addiction does not discriminate based on religion.”