I don't think you understood the evolution theory well: any change in the genetics of an organism is purely accidental.
What did you mean by accidental ? most physical/physiological changes most likely happen because of natural selection. Some specimens of X species tend to "survive better" because of Z physical trait, so there will be more probability for specimens with pronounced Z physical trait to reproduce and therefore carry the gene in cause of Z particularity (slightly smaller/bigger, longer teeth etc... whatever).
That surely is not "conscious" evolution, but that's not accidental. It is at the same time random, strongly influenced by environment, as well as organism behaviour, there's a reason behind any changes : life/organisms adapting to keep on living.
But not cannabinoids coming from weed.
That's probably true, but that doesn't change the fact that our brain is luckily able to interact in a specific way with them, which can be used for different purposes, may it be recreational, medical or creative.
Plus, weed have always been around our species. It might have been one of the first plant with medicinal and psycho-actif effects we discovered... until recently. I'm not saying I'm sure it did influence our brain structure over the millions of years, but it's not something unlikely. (if the interaction with cannabinoids from other source did influence the structure of our brain)
So what's your point? That humans were supposed to smoke weed? Our body reacts with asbestos too. Was it supposed to?
No, humans are only supposed to do what they feel like they should be doing, in the limits of respect for their fellow man and environment.
My point is weed shouldn't be illegal and people shouldn't be prosecuted and persecuted for using it. People abusing it, like any other substance, food, or behaviour putting their health and other people's health at risk, should be helped to be freed from it (at least if they're willing to).
Our body react with asbestose in a way that harms us and shorten our longevity, as everything does if exposed in excessive amounts. Life ain't that easy, we're not invincible to diseases and parasits.
I don't quite see the comparison with marijuana, it does not harm us the same way asbestose does. Not saying it can't harm us (driving, lungs if smoked etc...).
Last edited by deprav; Nov 10, 2013 at 06:07 AM.