World No Tobacco Day, often casually called World Tobacco Day in exam questions, is officially observed every year on which of the following dates?

Introduction / Context:
This question is about World No Tobacco Day, which some exam questions informally refer to as “World Tobacco Day”. The observance is aimed at highlighting the health risks associated with tobacco use and advocating for effective policies to reduce tobacco consumption. It is a major World Health Organization campaign and is regularly asked in competitive exams focused on health and social awareness.

Given Data / Assumptions:

• The observance is World No Tobacco Day.
• The options are 30 May, 31 May, 1 June, and 5 June.
• We must choose the correct date on which this day is officially observed worldwide.

Concept / Approach:
World No Tobacco Day is observed every year on 31 May. The day is used to inform the public about the dangers of tobacco, the aggressive marketing of tobacco companies, and the importance of tobacco control policies. The other dates are close to the end of May and start of June but do not correspond to this specific WHO observance.

Step-by-Step Solution:
Step 1: Identify the observance: World No Tobacco Day, devoted to anti-tobacco awareness. Step 2: Recall that WHO and member states observe this day on 31 May every year. Step 3: Compare with the options: 30 May, 31 May, 1 June, and 5 June. Step 4: Confirm that 31 May exactly matches the official WHO date for World No Tobacco Day. Step 5: Recognise that 30 May and 1 June are adjacent days used only as distractors, while 5 June is World Environment Day, not a tobacco-related observance. Step 6: Select 31 May as the correct answer.

Verification / Alternative check:
WHO campaign materials, government health websites, and news articles on tobacco control all refer to 31 May as World No Tobacco Day. Every year, the theme and message for this day are announced well in advance, always tied to this specific date, confirming that 31 May is correct.

Why Other Options Are Wrong:
30 May: One day before the official date, placed as a close distractor.
1 June: One day after the official date and not the correct observance date for this campaign.
5 June: Recognised as World Environment Day, which deals with broader environmental issues, not specifically with tobacco.

Common Pitfalls:
Students sometimes confuse World No Tobacco Day with World Environment Day because both fall around the end of May and early June, and both relate to public health. A good way to remember is that tobacco, a general health risk, gets a date at the very end of May on 31 May, while environment gets its own day right after, on 5 June.

Final Answer:
Therefore, World No Tobacco Day (World Tobacco Day in some questions) is officially observed on 31 May.