The smoker is de facto responsible. Other kinds of responsibility could extend some blame to the manufacturers etc. Those are not responsibility in the de facto sense.

For example, someone sells a car to a person that commits a crime using it; the car seller is not involved in the planning or execution of the crime. The car purchaser is solely de facto responsible for the crime. I am using responsibility in the narrow de facto sense.

The tragedy of the commons is not a purposeful result