Here are two lessons on recreational drugs. The first helps students understand the range of mechanisms by which different recreational drugs affect synaptic activity. There is a lesson plan, slideshow and an activity in which students must work out the effect of a different drugs on postsynaptic firing rates. The second lesson explores where our understanding of cannabinoids comes from and contains different activities to get students thinking about biopsychological research. There is a lesson plan, a slidehow and a reading on cannabis research. Edit: here is a link with more detail on the reciprocal teaching routine. Also, I forgot there was a Socrative quiz to go with this lesson.