Cocaine is made from the coca plant; the leaves of which can be chewed raw for a similar, but markedly weaker, effect.

I doubt tobacco has to be processed to be smoked.

Psilocybin mushrooms require no processing.

Peyote requires no processing.

Alcohol be found naturally from rotting, fermented fruit fallen from trees. There's a video on Youtube of animals getting drunk from eating it.

I'm sure there are several other plants that will get you high that I'm unaware of. Just thought I'd throw a little knowledge out there for anyone who might be interested.

Good luck collecting enough poppy seeds. Same deal on the coca leaves, but try eating a mouthful. Same deal there on tobacco. The same logic applies to caffeine, chocolate, and alcohol. The drug is extremely weak in it's natural form so it requires a decent amount of work to get something really psychoactive.

To him, you can simply pull a marijuana bud off a plant, like an apple from a tree, and eat it for the full effect. That's quite a contrast.

Psilocybin and peyote apply but I don't think he's ever had the opportunity, especially since they don't grow like a weed.

His point: Nature has done a pretty remarkable job providing for our physical and mental health. Why muck with that?