Stoned California Seniors Headed to ER's By the Thousands: UCSD Study

[Celerity]

74. Weed in the 70s & 80s was nowhere near 20% THC. Most were 1 to 5% with an 8 to 10% (rare) max range

https://www.revolutionaryclinics.org/thc-potency-over-time/

In the early days of cannabis engineering, THC levels were extremely low by today’s standards. In fact, average THC levels in the 1970s hovered just under 5% (sometimes even lower, depending on the quality of your cannabis). Because THC is central to the psychoactive effects pursued by many weed users, high-THC cannabis has always been in high demand — and when there’s a demand, the market will supply.


https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6312155/

The primary problem with the current available cannabis in dispensaries in Colorado is that the THC content is not like it used to be. Prior to the 1990s it was less than 2%. In the 1990s it grew to 4%, and between 1995 and 2015 there has been a 212% increase in THC content in the marijuana flower. In 2017 the most popular strains found in dispensaries in Colorado had a range of THC content from 17–28% such as found in the popular strain named “Girl Scout Cookie.” Sadly these plants producing high levels of THC are incapable of producing much CBD, the protective component of the plant so these strains have minimal CBD. For example the Girl Scout Cookie strain has only 0.09–0.2% CBD.

The flower or leaves that are generally smoked or vaped are only one formulation. We now have concentrated THC products such as oil, shatter, dab, and edibles that have been able to get the THC concentration upwards of 95%. There is absolutely no research that indicates this level of THC is beneficial for any medical condition. The purpose of these products is to produce a high, and the increased potency makes them potentially more dangerous and more likely to result in addiction.


https://herb.co/learn/modern-day-weed-vs-hippie-weed/