The European Union says it ain't so.
"Statements in the popular media that the potency of cannabis
has increased by ten times or more in recent decades are not supported
by the limited data that are available from either the USA or Europe.
The greatest long-term changes in potency appear to have occurred in
the USA. It should be noted here that before 1980 herbal cannabis
potency in the USA was very low by European standards....
"The natural variation in the THC content between and within
samples of herbal cannabis or cannabis resin at any one time and place
far exceeds any long-term changes that may have occurred either
in Europe or the USA."
Drug policy should be based on science, not politics.
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"Parents are often unaware that today's marijuana
is different from that of a generation ago, with potency
levels ten to twenty times stronger than the marijuana
with which they were familiar."