Yes sniffing or inhaling the rosemary essential oils can help improve your memory and may even prevent dementia or other memory problems related to aging.
Many people including myself have noticed an increase in memory power and brain function as a result of sniffing and inhaling rosemary essential oils on a daily basis.
I always feel more alert and awake and my brain seems to process things much faster when I inhale the rosemary essential oil.
Give it a try and I'm sure you'll see an increase in alertness and memory when sniffing or breathing in rosemary essential oils.