Postsynaptic neurons display receptors to which the neurotransmitter binds.
These drugs fall into several distinct families. Link to discussion of the sympathetic nervous system. ACh is a neurotransmitter at synapses early in the pathways of sympathetic stimulation. Although a weak drug in one sense, nicotine is strongly addictive. The use of chewing gum and skin patches containing nicotine is designed to satisfy the craving for nicotine while avoiding the serious health effects of other ingredients in cigarette smoke.