Substance use rarely appears out of nowhere in a child’s life. It can grow inside homes actually, shaped by daily routines, stress, silence, and example. A large study published in takes a deeper dive at this link. It asks a hard but hopeful question: can the way adult parents soften, or even stop, the passing down of substance use from one generation to the next? The answer is not simple, but it might be reassuring for families trying to do better, even when the odds feel stacked against them.





How substance use passes from parent to child



Children learn long before anyone explains things to them. They notice how adults relax, cope, celebrate, or escape. The study followed over 4,000 adolescents and their parents in Brazil and found a strong alignment between parent and child substance use patterns, especially when parents did not use substances at all. This shows how powerful everyday modeling can be.





But the study also makes one thing clear: similarity does not mean destiny. Even in homes where parents used substances, children did not automatically follow the same path. Something else mattered, and it mattered a lot.