Basic and Clinical Sciences (BCSE) 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is defined as the residues of second-hand smoke that collects on surfaces and dust?

Sidestream smoke

Third-hand smoke

Third-hand smoke refers to the residual toxins from tobacco smoke that adhere to various surfaces and dust. This residue can accumulate on furniture, walls, clothing, and other surfaces, remaining long after the smoking event has ended. It includes not only the chemical compounds from the tobacco but also other harmful constituents that can pose health risks, particularly in environments where children or non-smokers are exposed.

Addressing the other terms: Sidestream smoke is the smoke that comes from the burning end of a cigarette or tobacco product. Mainstream smoke is the smoke exhaled by a smoker, while passive smoke, also known as secondhand smoke, is the inhalation of smoke from both the burning tobacco and the smoke exhaled by smokers. These options are focused on the active or immediate exposure to smoke, rather than the lingering residues that are characteristic of third-hand smoke.

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Mainstream smoke

Passive smoke

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