Which of the following actions should be avoided to reduce fire risk on construction sites?

Cigarette smoking near combustible materials poses a significant fire risk on construction sites. It is critical to avoid this practice because such actions can easily ignite flammable substances, leading to potentially devastating fires.

Implementing strict no-smoking policies in areas where combustible materials are stored or used is an essential safety measure. This measure significantly lowers the likelihood of accidental ignition, ensuring the safety of workers and the surrounding environment.

In contrast, the other options represent essential practices that would actually enhance fire safety on construction sites. Proper storage of materials and keeping flammable materials away from heat sources are preventative measures that help minimize the risk of fire. Regular fire drills are also vital, as they ensure that all personnel are prepared to respond effectively in the event of a fire, thereby increasing overall safety.