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The fragrance released by Chinese rose (Rosa chinensis) can suddenly cause some people to feel chest tightness, discomfort, a suffocating sensation and difficulty breathing after smelling it.

The fragrance released by orchids, when smelled for a long time, can make people overly excited and cause insomnia.

If the pollen released by the redbud (Cercis chinensis) comes into contact with a person for too long, it can trigger asthma or worsen coughing symptoms.

At night, the night-blooming jasmine (Cestrum nocturnum) can release large amounts of strongly olfactory-stimulating particles; people with high blood pressure and heart disease easily feel dizzy, depressed and unwell, and their condition may even worsen.

The flowers of the tulip contain an alkaloid; if a person comes into contact with it for too long, it can accelerate hair loss.

If the scent released by the flowers of oleander (Nerium oleander) is smelled for too long, it can make people drowsy and reduce mental acuity; its milky white sap, if contacted for too long, can also cause poisoning.

The fragrant scent released by coniferous and cypress trees and shrubs has an irritating effect on the human gastrointestinal tract; if smelled for too long, it not only affects people's appetite but also makes pregnant women feel restless, nauseated and dizzy.

If the particles released by hydrangea (Hydrangea macrophylla) come into contact with a person, they can cause skin allergies and itching in some people.

The flowers of the yellow azalea (Rhododendron molle) release a toxin; once accidentally ingested, it can cause mild poisoning in mild cases and shock in severe cases, seriously harming health.

If the fragrance released by lilies is smelled for too long, it can overstimulate the central nervous system and cause insomnia.