Hmmmmmmmmmm.....
I remember a burn of captured contraband at an incinerator near San Francisco in the summer of 67. It had been announced as to date and location and all the hippies in the West tried to get there for the occasion. The place was surrounded by crowds of freaks trying to get high off the air pollution. Many swore they got stoned from it but I suspect a lot of that was hyperventilation. There was definitely a characteristic aroma in the air for an hour or so. I thought the announcement was stupid but the local pols were trying to get public brownie points for destroying the evil weed.