(jorge cervants)one of the most popular marijuana growers said that thaking clones from clones is not bad they just will producer alittle less bud.But other that that i would do it because it saves time rather then growing from seed all over again.He also says that cloning from flower plants can be done it just wll be alot harder and will stress the plant it was takin from and retard its flowering ability.if taking clones from a flowering plant it would be best taking cuttings from the lower branches were more hormones are.Make sure to feed nothing but water to clones and cut there leaves in half.