The reason drugs have side effects in some people and not in others is the body uses the same mechanisms over and over to do different things so non-targeted nerves are equally affected. The other reason is people’s nerves are slightly different from each other in nerve density and layout. Sort of like some trees have lots of branches and loads of leaves and others of the same species have fewer branches and fewer leaves. You probably know somebody who salts the heck out of his food and can drink hot sauce from the bottle while others never salt their food and can’t bear hot sauce. Those preferences are likely caused by different nerve density or layout.
I’ve had way too much to drink tonight at Mr. GG2’s birthday bash and you are getting on my last nerve density. :-)