Smith Cart doesnt save user passwords in any of the Smith tables, all dnn user and password information resides in dnn and aspnet membership tables. If you want to migrate users from an old portal to a new one some of the tables that need to be migrated are the following:
- aspnet_membership
- aspnet_users
- Users
- UserProfile
- ProfilePropertyDefinition
- UserRoles
- UserPortals
Please see the following posts that explain how to migrate dnn user data:
http://stackoverflow.com/questions/16409872/how-can-i-migrate-users-from-dotnetnuke-4-9-to-7
http://mitchelsellers.com/blogs/2007/03/11/manually-migrating-users-(335---441)-revisited.aspx
Hope this helps!