I imagined that all monastics lived in a perpetual catatonia of euphoric bliss. I believed they manifested this by hyperventilating. Why did I think this? Because I was fourteen. There is very little that separates the mind of a fourteen year-old from that of a lunatic or a fanatic. (No offense meant to any readers of age fourteen; it'll pass in 365 days or less.)
Anyway, for the most part, monks don't get high.