In the north of Portugal there is a village where parents and children smoke together on the Three Kings Day. It is a century old tradition that also includes dancing around the fire, traditional wine and lupin beans. The community of Vale Salgueiro is embracing the tradition every year and according to local media, the parents are not worried about their children action as it is a one time thing.
As a portuguese person I feel the need to explain that this is not a Portuguese tradition, it is confined only to a small village (Vale de Salgueiro) in the northernmost region of Portugal. It is heavily frowned upon and criticised by some 99.9% of the portuguese population.