Well, I don't eat that much pork anyway -- hams or otherwise. And the ham we've been getting lately is from Vermont.
When you say "Smithfield ham" to me I think of the ham coming from a peanut-fed pig that has been locally slaughtered and then smoked and dry-cured. NOT something that comes from a plant.
I can support such a boycott. I'll even check the few pork products we do buy locally.