Can I tell one of the workers installing a fence to stop smoking?
Why do you want to tell the worker to stop smoking?
The smoke really bothers me and second hand smoke is dangerous for my health.
I'm sure the smoke is bothering you and you have a right to ask them to stop. You shouldn't be exposed to second hand smoke because it's dangerous for your health.
Second hand smoke is disgusting.
You should approach the worker and let them know that smoking is prohibited. They shouldn't be smoking on company time and while on private property. Let them know if they want to smoke to go somewhere on their break.