I have this sentence:
People smoking cigarettes is unhealthy.
What kind of word group is "people smoking cigarettes"? I understand that "smoking cigarettes" can be a gerund phrase and it can act as a singular subject; hence, we use "is," for it, a singular noun.
For example, "Smoking cigarettes is unhealthy."
But what purpose has "people" here? Is it the actual subject instead of "smoking cigarettes"? If people is the subject then using "is" will be incorrect as people is a plural subject.
"People smoking cigarettes is unhealthy" sounds correct to me, but I just don't understand clearly what function do "people" and "smoking cigarettes" have got here. Please help. I'm really confused.