Possible Clues:

• April 20th substance, and a hint to this puzzle's theme
• Cannabinoid agonist responsible for many a vapid philosophical discussion
• Strong weed has a lot of it: Abbr.
• Marijuana ingredient
• Active ingredient in marijuana: Abbr.
• Cannabinoid letters
• Baking ingredient?
• Marijuana's active substance: Abbr.
• Terpenoid organic chemical that makes music sound really awesome
• Burnout's active ingredient