Not only do unconditional cash transfers *not* lead to gambling, drug, or alcohol use, some studies find these behaviors are *reduced* by transfers, perhaps because they alleviate the financial and mental stresses that generate them.
"Decades of research on unconditional cash transfers (guaranteed income or otherwise) has consistently demonstrated that providing unrestricted aid does not lead to gambling, drug use or profligacy. In fact, some studies show that providing cash can reduce such behaviors, presumably because it alleviates the financial stresses that generate them."
empirical