Simple Schema Mapping Question. hbm to ddl control

If in my classmap I have

SchemaAction.None();

and if I also have in my session configuration

.ExposeConfiguration(cfg =>
         {
             new SchemaExport(cfg)
             .Create(false, false);
         })

Can I ensure that nhib will not touch the db schema in any fashion. In other words the only write action will be that of entities to the tables