Given that the album came out in 1975, the smell of Mary Jane would be common. It sure was during that concert! I didn't inhale (much). No wonder my growth has been stunted.
I was a very naughty Bagster during that time, as well. I am very pleased to report that I smoked a great big Thai stick (or two) at the Santa Barbara County Bowl, outdoors on a sunny day, while I watched Bob Marley in 1979.
Here's the concert. See if you can find Bagster and his friends in the crowd.
I assure you, the warm smell of colitas rose up through the air.
I am much more well-behaved now. Kinda.