Question

which of the following statements about secondhand smoke is not true?
a. the particles found in secondhand smoke are smaller than the particles found in firsthand smoke.
b. secondhand smoke can have higher concentration of dangerous chemicals than firsthand smoke.
c. secondhand smoke is inhaled less deeply than firsthand smoke.
d. breathing secondhand smoke is at least as dangerous as breathing firsthand smoke.

please select the best answer from the choices provided.

○ a
○ b
○ c
○ d

Explanation:

• Option A: Secondhand smoke particles are indeed smaller than firsthand smoke particles, as firsthand smoke has larger filtered particles from the cigarette filter, making this true.
• Option B: Secondhand smoke (sidestream smoke) can have higher concentrations of some toxic chemicals than mainstream firsthand smoke, so this is true.
• Option C: There is no evidence that secondhand smoke is inhaled less deeply; in fact, involuntary inhalation can still reach deep lung tissue, and this statement is not accurate.
• Option D: Health research confirms secondhand smoke is at least as dangerous (in some cases more so due to unfiltered particles/chemicals) as firsthand smoke for non-smokers, making this true.

Answer:

C. Secondhand smoke is inhaled less deeply than firsthand smoke.