IT JUST ADDS A LAYER OF ADDICTIVE RITUAL: Smokers Who Roll Their Own Are Less Likely To Quit. Though the study authors give a different explanation: “Roll-your-own smokers were less interested in quitting because of the cheaper cost of their cigarettes, the study found. Only factory-made cigarettes are taxed, the researchers explained.”

Plausible, but I note how much science these days seems to extol the virtues of higher taxes.