These answers are not written by me. When I'm looking for information, I trust that the first answer I get from a Google search is the right one for me. I will add this rather in-depth the answers that I have received while searching for information. Maybe one of them resonates with you too.

For the first time in my life in 2017 while living in Mexico, I Googled Angels, who they are and what each of them represents, mysteriously the pages other than those related to angels turned black.
I had about a dozen pages open at the time, on different topics. The images, videos and texts of the angels remained visible on two pages. This has never happened before or since, pages turning completely black. That's why I believe that also these scents that I've experienced also come from angels or my spirit guides.
Years ago when I was depressed and looking for a new direction or path in my life, I smelled lilac, jasmine and rose at the same time, of course from different directions. Since then, only one at a time and not very often. "Scent of Lilac in Troubled Times: Comfort and Strength from the Spirit World."
Lilac
1.The scent of lilacs often heralds the arrival of spring, symbolizing renewal and rebirth.
2. Connection with the Divine: Lilacs have a long-standing association with the divine.
3. The sweet aroma of lilacs is often linked to feelings of love and compassion.
4. Lilacs can also be a symbol of intuition and insight. Their unexpected scent might arrive at moments when we are seeking answers or direction.
5. This flower’s aroma can be a gentle reminder to seek balance, to nurture our mental and emotional well-being, and to find peace amidst life’s turbulence.
6. Smelling lilacs can sometimes be interpreted as receiving guidance from a guardian spirit or angel.
7. For those on a spiritual journey, the scent of lilacs can signify spiritual awakening. https://www.spiritualunite.com/
Jasmine
1.This reveals that something good is about to happen in your life. It helps you to stay positive, hopeful, and full of faith.
2. Self-confidence: If you battle with self-doubt, you might get a sign from jasmine. Let it inspire you to believe in your abilities and skills.
3. Another spiritual reason for perceiving jasmine out of nowhere is concerning your angel and you might get strange spiritual omen.
4. Have you ever wondered why you keep smelling jasmine out of nowhere during moments of prayer? Well, the reason for this is because your prayer has been answered.
5. If you battle with negative thoughts, a lot will be affected in your life. You need to cleanse yourself. Well, this is where the smell of jasmine comes in! Anytime you perceive this smell, it’s believed to act as a spiritually purifying agent, which takes out negative energy from your energy centers.
6. The spirit of your loved one is around.
7. The moment you begin to smell jasmine out of nowhere, it’s believed to be a sign of a spiritual awakening. https://www.mucosis.com/
Rose
When you experience the scent of roses without a physical source, it’s often considered a sign of a guardian angel or a spiritual presence. This phenomenon can symbolize love, protection, and guidance. This widespread occurrence can signify universal love, the interconnectedness of all things, or a reminder to remain open to the mysteries of the universe.
1.The aroma of roses often brings to mind feelings of love and affection. It could also be a sign encouraging you to open your heart to receive love from others, and even from the universe itself.
2. In spiritual beliefs, roses are seen as a bridge between the physical world and the spiritual realm. This scent serves as a reminder that you are not alone and that spiritual beings are watching over you.
3. The unexpected smell of roses can signify messages from loved ones who have passed on. In many spiritual circles, this scent is seen as a sign that a departed loved one is trying to communicate.
4. Smelling roses without a physical source could indicate a period of spiritual awakening. This experience might occur during a time when you’re exploring your spiritual path or seeking deeper truths about life.
5. Roses are often associated with positive energy and good vibes. Smelling roses spontaneously could be interpreted as a surge of positivity in your life. It encourages an attitude of gratitude and optimism.
6. The scent of roses is sometimes seen as a direct connection to the divine. It’s a sign that encourages faith and trust in the greater plan of the universe, reassuring you that you’re part of something much larger than yourself.
7. Roses symbolize beauty and grace, and smelling them unexpectedly can be a reminder to appreciate the beauty in the world and in your life. It’s a call to slow down, enjoy the small things, and recognize the grace that surrounds you. This experience can bring a sense of peace and contentment, reminding you of the elegance and simplicity life offers.
8. Experiencing the scent of roses without a visible source can also signify a deep connection with nature. It serves as a reminder that we are part of the natural world, not separate from it. This connection can be grounding, providing a sense of belonging and reminding us of the interdependence between humans and nature.
Cinnamon
Just when I resigned from my full time job and was about to start my new adventure as an entrepreneur here in Athens. For this the first explanation was: 'This could mean a myriad of things, from the need for protection or purification in your life to signs of impending wealth or success, or even a need for healing or personal growth.' https://spiritualmeanings.net/
I guess it was just a reassurance that everything is gonna be OK, that I'm on the right path. The best things I could hear: Being protected, earnings would be enough to cover the living costs and personal healing and growth on my spiritual path.