Forever, it lasts.
I had some tobacco from china with a mega opium count, and it has lated 3 years, I still mix it into a spliff now and then and get all sheets.
If you have the powder, depends on humidity and if its cut.
Canadabis Reviewed by Canadabis on . Opium :confused: Anyone know how long you can keep opium and it still be good? Rating: 5