Not full of them, but I’ve always been especially fond of plants, and poppies in particular because my mom grew some spectacular varieties. Through boredom and interest I discovered a home nearby was growing a variety of poppy which could be processed into opium. I took some seed heads at the correct growth stage on an evening walk, then processed them later.

The process is very crude but works well for experimentation. I think if you were a serious opiate user it would probably be too inefficient and inconvenient to warrant over simply buying opium.