Why Does Weed Make You Hungry? The munchies are a common phenomenon for cannabis enthusiasts, and represent one of the plant’s most well-known effects. It hits some people more than others, but most who have consumed cannabis will have noticed a sudden and powerful surge in their appetite. As cannabis becomes more widely studied, scientists have started to ask, “Why do we get the munchies?” It turns out there are several scientific reasons for the munchies, many of which involve the neurotransmitters …