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First, it is not healthy for people to smoke
→First, cigarettes are not healthy for people
Smokeを重複して使わない方がいいと思うので

Second, it is not safe(‪✕‬safety) for people to be on sidewalks.

For instance, if there is heavy traffic, they bump into people.
→For instance, if someone is smoking in a crowd, many people could be secondhand smoke.
 *second-hand smoke(副流煙)

こんな感じでどうでしょうか?

ご丁寧にありがとうございます😭💞
助かりました!!

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