One of the firsts see in junkies is that they lack on money most of the time. After repeated use of heroin, more long-term effects may begin to appear. Chronic users may develop collapsed veins,...
well if it has veins then it is a living animal or human, if it is like a rock, tree, flower, car, nut, computer, shoe, clothes, anything that is not living has no veins.
Depending on what type of leaf - a monocot leaf (grasses etc) have parallel veination and dicot leaves (woody plants) have reticulate veination (more randomly spread).