But most of all the question is asked by addicts themselves. These questions are never satisfactorily answered but there are lots of interesting theories. For someone with an established addiction, these questions are academic. Addicts come from all walks of life. There are certain racial differences.
Some addictions are more common in one sex or the other, but no group is immune.
Most drug users simply say that heroin makes them feel good. They used it first because it was there and they come back for more because they liked the effects. Tobacco is a 'dirtier' drug in many ways than narcotics or cannabis. But smokers are all around us. Nice' people also sometimes become gamblers, they get fat, they drink and smoke and some even use heroin.