Statement: Smoking is one of the human weaknesses that tests a smoker’s willpower to the edge.\nConclusions:\n1) It is very difficult for smokers to quit even if they want to.\n2) Human beings have other weaknesses as well.

Introduction / Context:
The statement frames smoking as a “human weakness” that pushes willpower to the limit. From this, we evaluate conclusions about quitting difficulty and the existence of other weaknesses.

Given Data / Assumptions:

• Smoking qualifies as a human weakness.
• It severely tests willpower.
• “One of” indicates there are multiple human weaknesses.

Concept / Approach:
If smoking strains willpower to the edge, it is reasonable to infer that quitting is very difficult even for those who wish to stop (I). The phrase “one of the human weaknesses” directly implies others exist (II).

Step-by-Step Solution:
1) From “tests willpower to the edge,” infer high difficulty of quitting (I).2) From “one of,” infer plurality of weaknesses (II).

Verification / Alternative check:
The language choice (“one of” + “tests … to the edge”) strongly supports both conclusions without requiring extra facts.

Why Other Options Are Wrong:
Choosing only one ignores the plain meaning of the other; “neither” contradicts the statement; “either” misstates necessity.

Common Pitfalls:
Overly literal readings that ignore the clear implications of “one of” and “to the edge.”

Final Answer:
Both Conclusions I and II follow.