A CFI AND HIS STUDENT PLT SUFFER THROUGH ONE CRITICAL GND CONFLICT AND ONE NON CRITICAL DUE TO NON TWR TFC PATTERN DEVS AT 42J; FL.

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ENTERED PATTERN WITH NORMAL 45 DEG R TURN 1000 FT FOR RWY 4. SMOKE FROM FIRE N OF FIELD INDICATED RWY 4 BEST. NO OTHER TFC HEARD ON UNICOM OR SEEN BY ME OR MY STUDENT. NO TFC OBSERVED IN GND TAXI OR IN PATTERN FLYING TO INDICATE RWY IN USE; SO PROCEEDED TO LAND. AFTER TOUCHDOWN AND DURING ROLLOUT MIDWAY DOWN THE RWY; A C150 APPEARED LNDG ON RWY 22. HE ADDED PWR; MOVED OVER TO MY L AND EXECUTED A MISSED APCH. THE CESSNA THEN LANDED AND I TALKED TO THE PLT WHO CAME INTO THE FBO. I TOLD HIM THE SMOKE FROM THE FIRE PROBABLY REDUCED THE VISIBILITY OF BOTH PLANES; AS WE WERE WHITE/RED (SO WAS HE) IN COLOR. NO VOICE XMISSIONS WERE HEARD EVEN THOUGH I HAD THE RADIO ON AND WAS INSTRUCTING THE STUDENT HOW TO LOOK FOR OTHER TFC AND 'SEE AND BE SEEN.' SEVERAL OTHER ACFT LANDED AFTER ME; USING RWY 4. ON MY DEP I ELECTED RWY 22 AND A T34C WAS EXECUTING A LNDG ON RWY 4. HE SWITCHED TO RWY 22 AFTER HE SAW ME ON THE END OF RWY 22. THE WIND WAS LIGHT AND VARIABLE. WINDSOCK WAS LIMP SO WAS OF NO USE. SMOKE FROM FIRES N OF FIELD WERE BEST INDICATORS OF WIND.