CREATE TABLE table_706 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

what's district with candidates being lawrence j. smith (d) 69.4% joseph smith (r) 30.6%
SELECT "District" FROM table_706 WHERE "Candidates" = 'Lawrence J. Smith (D) 69.4% Joseph Smith (R) 30.6%'
SELECT "District" FROM "table_706" WHERE "Candidates" = 'Lawrence J. Smith (D) 69.4% Joseph Smith (R) 30.6%'