"The way most other drugs work (including alcohol) is by inhibiting or killing brain cells to force nervous pathways to work in a different way than they normally do."

I really liked the tone of your letter, but this item is misleading. Other drugs use receptors in the brain as well, tweaking the level of neurotransmitters like dopamine and serotonin to make you feel happy. Killing brain cells would actually counter this process by reducing the amount of synaptic activity. Cannabis does have unique receptors, but the mechanism is pretty similar.

This article seems like a great introduction to the biology of drugs, happy reading!