There is, of course, exceptionally strong cannabis to be found in some parts of the UK market today: but there always has been. The United Nations Drug Control Program has detailed vintage data for the UK online. In 1975 the LGC analysed 50 seized samples of herbal cannabis: 10 were from Thailand, with an average potency of 7.8%, and the highest was 17%. In 1975 they analysed 11 samples of seized cannabis resin, 6 from morocco, average strength 9%, with a range from 4% to 16%.
To get their scare figure, The Independent have compared the worst cannabis from the past with the best cannabis of today. But you could have cooked the books in exactly the same way 30 years ago if youÂd wanted: in 1975 the weakest herbal cannabis analysed was 0.2%; in 1978 the strongest herbal cannabis was 12%. Oh my god: in just 3 years herbal cannabis has become 60 times stronger.
Point being that a single anecdote (or even a handful) tells you nothing.