Do slogans count as punctuation marks in sentences?

If there is an exclamation point or a period after "No Smoking", it is a sentence; If there is no exclamation point or period after it, it is a phrase.

Phrases belong to the standby unit of sentences, but many phrases become sentences with a certain tone and intonation. To put it simply, a sentence without punctuation marks (period, question mark, exclamation point) is a phrase, and a sentence with punctuation marks at the end is a sentence.