stratos stratos:
http://medicalmarijuana.procon.org/view.answers.php?questionID=000336
"For comparison, the national average of marijuana's THC content in 1978 was 1.37%, in 1988 it was 3.59%, in 1998 4.43%, and in 2008 8.49%."
Now hemp was banned in the late 1800's I think. so if the increase over just a 30year time span is this much I think it is safe to say that it has grown even more when compared to 1908 to 2008. A guess of 1000x's more THC is a reasonable guess. I do admit it is a guess.
Are you serious? This is your reasoning for stating there is 1000 X more THC? Laughable. Do you have any further "evidence" of your claim? Surely you are not suggesting that there was no such thing as a concentrate?
From your source:
$1:
Hashish and hash oil, on the other hand, showed no specific potency trends. Other major cannabinoids [cannabidiol (CBD), cannabinol (CBN), and cannabichromene (CBC)] showed no significant change in their concentration over the years."
But Cannabis has gotten 1000 X stronger? Oh I get it they use much less material now do they?
I think you also forgot to look at the Con side of the site. Just saying.