I once (last year) had a case of immediate stasis when I bought a small 'try it out' packet of some mix w) which had yummy herbal etc things in it (lots of nice looking dried flowers etc). It was from a supplier that was meant to be lots of peoples favourites. I guess it was either a duff batch or that bun just reacted to it in some way. The other a gave a small amount to at the same time were fine - but I imediately threw the lot anyway.
Good Luck with Stanley . .