Smyrna is a town/place in Tenesse.
There is also a plant in Canton, Mississippi. Although you'd have to use Nissan USA's web site to locate dealers,
http://www.nissanusa.com
Or there might be some useful information on Infiniti's web page,
http://www.infiniti.com
As for exporting to China, you'd probably have to purchase the vehicle here and get a separate company to export it. I'm sure that would cost a lot of money to get it out of the country. Although I'm not one to answer questions about American export regulations.