“The toxicity of a Woodstock joint was relatively low—a modest amount of THC. Today the levels can get a lot higher, just like the user. And there are a number of people who are now using extracts that are almost entirely pure THC. Whatever kick that mule had back in the seventies, it is about four to six times greater than that now. This is kind of like the difference between a Bud Light and a shot of Old Gym Sock Corn Whiskey”
Devoured by Cannabis, p. 2