Without knowing exactly what anti-smoking commercial/advertisement you are discussing, I will encourage you to analyze the persuasive techniques used and how effective they are.
There are common techniques used in advertising (both print, audio, and film/TV) which you should look for in the example you must analyze. Use the list below:
- Bandwagon: "everyone" is using (or not using) the product
- Celebrity endorsement: is someone famous featured? Consider in audio, is a famous voice used?
- Emotional appeal or transference: the ad is designed to trigger a specific emotion which the audience may then transfer to the product. (In this case, perhaps the emotional appeal is fear. The ad is somewhat scary making the audience believe cigarettes are somewhat scary.)
- Plain/average people: appeals to the everyday/common person.
- Individuality/anti-bandwagon: sends the message that not everyone is doing it, therefore by doing it you will be unique.
- Slogan: a catchy saying that sticks with the audience
- Loaded words: uses words with very obvious positive or negative connotations
- Product comparison: stacks one product against another to show obvious advantages over disadvantages
You could include one or more of the above techniques in writing your advertisement analysis, and show whether they are effective.