I have heard of chickens eating people's poppy plants, but no responses as to if they are bad for them or if they get "hooked".I would say sure to the sesame seeds - chickens eat seeds. Not so sure on the poppy seeds.. don't they contain a narcotic? I don't know if chickens would eat seeds from a poppy.. I have California Poppies over here so I guess I will check when the seed pods pop. They are a lot smaller than most seeds I see the chickens eat.