This eucalyptus oil is fabulous for keeping units and mosquitos away. We live in the south on the gulf coast in a wooded area where these bugs are relentless in the Spring and early Fall. We light these about 20 minutes before going outside and the bugs stay away. We use wine bottle torches and keep them on the ground so the smoke will rise. If you elevate the torches, we found that the gnats and mosquitos will fly under the smoke area. The smoke is very minimal - you will not notice it or smell it - like a candle. Smoke is less than with citronella oil and burns longer. Also more effective than citronella. We have compared it to the citronella oil and is so much better so we have switched. Very little scent - a light eucalyptus scent. [This review was collected as part of a promotion.]