Questions about example sentences with, and the definition and usage of "Harmful"

A: "Harmful" describes something that is dangerous

A: Harmful in a sentence

(1) The drug can be harmful if taken in excess.
(2) We should stop factories from producing harmful gases.
(3) She actually considered fresh air harmful.
(4) Smoking is harmful to your health.

A: Knives can be harmful to you.
There are harmful bacteria that can damage tissue.
Many people would consider the radiation a phones gives off harmful to us.

A: Ex: Smoking is harmful to your health.

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A: They’re synonymous with each each other. They both imply that something could be damaging.

A: For one, harmful is much more commonly used and deleterious is pretty old fashioned😂😂

deleterious describes the effect on something as harmful.

for example.
sun tanning has deleterious effects on the skin.

whereas harmful explain the potential something has to be dangerous.

eg

suntanning is harmful for the skin.

A: Thanks for your reply! I have one more question. I watched a TED talk and in the talk the speaker said "Do you believe that stress is harmful for your health?". Is it more natural to use 'harmful to' in this sentence?

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A: thanks!, could you pronounce another ?

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