The full phrase sounds like this: "Every individual student should smoke cigarettes. You, Yura, are too young. Grow up a little."
In reality, it's just a way to remember the order of geochronological periods: Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian. Triassic, Jurassic, Cretaceous. Paleogene, Neogene.
Seeing the picture immediately brought back memories of my first year, when we had almost as much drawing as biology.
To sell my soul