Chemokine ligand 11 (CCL11), also known as eosinophil chemokine (Eotaxin), is a small molecular weight cytokine in the CC chemokine family.Eotaxin is selectively recruited by inducing chemotaxis in eosinophils, and is therefore involved in metamorphic responses.Elevated expression of Eotaxin in plasma of both humans and mice is associated with its senescence. The plasma of current marijuana smokers contains higher concentrations of Eotaxin than that of former marijuana smokers and never-smokers, and schizophrenics also have higher concentrations of Eotaxin, a known inducer of schizophrenia.