smell of cigarette

[arzgol]

Are my sentences proper English?

Even though nobody smokes in her floor, still the smell of cigarette enters her room.

So, whenever the guy on the upstairs starts smoking, the cigaratte oder carries through a vent and duct to her room.

Thank you for your response.

[Raymott]

Are my sentences proper English?

Even though nobody smokes in her floor, still the smell of cigarettes enters her room.

So, whenever the guy on the upstairs starts smoking, the cigarette oder carries through a vent and duct to her room.

Thank you for your response.

Yes, they're OK.
"Cigarette" isn't a mass noun, so "smell of cigarettes" is better.

[Rover_KE]

Even though nobody smokes on her floor, still the smell of cigarettes enters her room.

So whenever the guy on the upstairs starts smoking, the cigarette odour carries through a vent and duct to her room.

Rover

[Tdol]

Smell of smoke could also be used.