As a plant, roses may cause the following side effects and hazards if consumed in excess or used improperly:

1. Allergic reaction: Some people may be allergic to roses, causing skin Itching, redness, swelling, shortness of breath and other allergic reactions.

2. Poisoning: Excessive consumption of roses may cause poisoning, causing dizziness, nausea, vomiting and other symptoms.

3. Irritation: Some varieties of roses contain irritating ingredients, which may irritate the skin, eyes or other parts after use, causing discomfort or pain.

4. Drug interactions: In some cases, roses may interact with certain drugs, affecting their efficacy or causing adverse reactions.

In short, although roses have many benefits, you need to pay attention to the appropriate amount and correct method when using them to avoid unnecessary side effects and harm.