I was dumb blazed once and came up with this shit:
What if there were too forces in the world-drugs and power (government, society) and the the entire history of the world was a war between these two forces. Each era is defined by a different drug but most have been covered up by society. Of course a few leaked through the cracks and become footnotes in human history (such as the ancient Chinese opuim use). Each person is either on society's side or drugs' (possibly even pre-determined). However, each side has its flaws. Too many drugers go astray and abuse drugs "to get fucked up". This is why society always prevails of drugs unless it is ovrcome.

There was sooo much more but I forgot it. Shit.
Oh well, it's really far-fetched and just something cool to think about.