Jamie: I totally agree, it is factory farming and monocropping/industrial agriculture that's our main issue these days. We've lost the sense of how to treat any species (plant or animal) with respect to its natural life cycle and the environment. To me there's no difference to killing a plant or an animal. Both are sentient forms of life and deserve equal respect in my mind.

And I've got to disagree with you, TheStOrm: All the archaeological evidence shows that our ancestors ate wild game meats, birds, fish and shellfish. Lots of them! Pretty much any human habitated site is littered with refuse of animal bones (invariably cracked to obtain the marrow), midden piles of shells or fish bones (when near the ocean), not to mention all the stone tools that are clearly designed for killing animals and then processing the meat and hides. When it comes down to it, meat (especially organ meats) are the most nutrient dense and fat dense source of food for hunter/gatherer societies. Sure, wild plant foods were a big part of the diet too, but it is incredibly hard (if not impossible) to live off a diet of only wild plant foods. Veganism is a relatively new experiment, and is only possible because of the wide availability of nuts, seeds, avocados, coconut oil etc. obtained through agriculture.

Clovis points, (about 9000 to 12,000 years ago) are clearly not for killing plants. Grind it bind it, and shove it in a mammoth:

And the atlatl (precursor to the bow and arrow) is specifically designed for killing large game animals:

Re: poppy seeds - they sometimes have small amounts of opiate alkaloids deposited on the seeds depending on the strain and how it is harvested. Most people trying to get "high" from it use amounts around 1/2 to 1 pounds, so unless you are eating a whole lot of them you will probably be okay.

Re: heated vs. non-heated Cannabis - I have heard about heating (decarboxylation) making marijuana more strongly psychoactive. However, I think unheated marijuana can still be psychoactive, it just takes more to get there. One time a couple friends threw a quarter ounce of pressed hash (the green stuff made from compressed trichomes, like bubble hash it was not heated) into a blender with some avocados to make a smoothie. We split it between three people, it took a while to kick in but when it did I couldn't even get up off the floor for 5 hours! It was very psychedelic, I saw crawling visuals all over the walls and ceiling.