The most effective evidence to support a topic sentence in a cause-and-effect essay from the options provided is:
- "According to the CDC, 'quitting smoking now improves your health and reduces your risk of heart disease, cancer, lung disease, and other smoking-related illnesses.'"
This statement is credible, provides specific data from a reputable source (the CDC), and directly relates to the topic of smoking and its health consequences. The other options lack strong evidence, rely on anecdotal information, or do not come from reliable sources.