i would say much stronger than kratom, i IV heroin (or used to? haven't for a month) and get nothing from large amounts of kratom except mild WD removal. 20g of poppy pod tea gets me feeling mildly good.
it's a big step up. kratom is not really an opioid, poppy pod tea is morphine, codeine, thebaine (precursors to heroin, oxymorphone, hydromorphone etc) so really think if this is a good descision to make.
and the WD from poppy pod tea lasts about two weeks but is milder than a comparable heroin habit.