The link is to a story about very thorough sounding research in the US which shows that marijuana is indeed much stronger than it used to be in its THC levels:
I note that it is talking averages too, so presumably a significant amount in use is above that level.The latest analysis from the University of Mississippi's Potency Monitoring Project tracked the average amount of THC, the psychoactive ingredient in marijuana, in samples seized by law enforcement agencies from 1975 through 2007.
It found that the average amount of THC reached 9.6 per cent in 2007, compared with 8.75 per cent the previous year.
The 9.6 per cent level represents more than a doubling of marijuana potency since 1983, when it averaged just under four per cent.
Last year, The Guardian reported that tests in the UK indicated the average there was 14% (with a small number of samples at 20%).
I'm not sure if similar research is done in Australia. Will have to look around some other time.
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