Can be used by rubbing 2-3 drops into temples and also inhaling for 5, hold for 5 and exhale for 5 to assist in easing cravings for cigarettes. 5 mL bottle. I also used this in an inhaler and each time I had a craving I would also take the deep cleansing breaths. This helped me quit in Feb 2016 as I was unable to use other nicotine replacement options.