Final answer:
Switching from cigarettes to using e-cigarettes (ends) is not without health risks. The long-term health effects of e-cigarettes are still not fully understood and they may contain harmful chemicals and nicotine which can be addictive.
Step-by-step explanation:
The most true statement about switching from smoking cigarettes to only using e-cigarettes (also known as 'ends') is option c: The long-term health effects of using e-cigarettes are still not fully understood.
A study completed by researchers at the Harvard School of Public Health found that e-cigarettes may be harmful to the user's health. E-cigarettes contain nicotine and cancer-causing chemicals such as formaldehyde. There is also a risk of developing an incurable and potentially fatal disorder of the lungs, commonly called 'popcorn lung'.
Although some e-cigarettes claim to be free of certain harmful chemicals, since e-cigarettes are not currently regulated by the FDA, there is no way of knowing for sure whether the products are actually safe. Therefore, option c is the most accurate statement about switching from smoking cigarettes to using e-cigarettes.