Final answer:
The claim that teenagers who smoke can't have yellow teeth or smoker's breath is false. Smoking can cause yellow teeth, bad breath, and other oral problems regardless of age. It is also the leading cause of preventable death globally.
Step-by-step explanation:
The statement that teenagers who smoke can't have yellow teeth or smoker's breath because they're too young is false. Smoking can have numerous negative effects on various systems of the body, including the oral cavity, regardless of the smoker's age. In fact, smoking contributes to several oral problems such as staining of the teeth, which can lead to yellowing, and halitosis, also known as bad breath. Additionally, smoking has detrimental impacts on the respiratory and cardiovascular systems and is a major cause of preventable death worldwide.
Smoking is also linked to periodontitis, a form of gum disease, which is responsible for about half of the cases of gum inflammation. Smokers have a higher risk of tooth loss compared to non-smokers. Therefore, it's important to acknowledge that the harmful effects of smoking, including oral health issues, can occur in individuals of any age who smoke, including teenagers.