Question

which of these is a challenge to social relationships as a result of nicotine and tobacco use?
yellow teeth and nails
extra taxes on cigarettes
fear of expulsion from school
penalties from buying cigarettes if underage

Explanation:

To determine the challenge to social relationships from nicotine/tobacco use, we analyze each option:

• "yellow teeth and nails": Tobacco use causes yellowing, which can affect how others perceive the user, straining social interactions (e.g., others may be less inclined to interact closely due to appearance or smell associated with smoking).
• "extra taxes on cigarettes": This is a financial/policy issue, not a direct social relationship challenge.
• "fear of expulsion from school": Relates to school rules, not social relationships.
• "penalties from buying cigarettes if underage": A legal/penalty issue, not social relationships.

So the option related to social relationship challenges is "yellow teeth and nails".

Answer:

yellow teeth and nails