Whether e-cigarettes will disappear by 2050 is still unknown. Because whether e-cigarettes will disappear depends on many factors, including but not limited to public attitudes towards e-cigarettes, government regulatory policies, scientific research progress, and so on.
The US Centers for Disease Control and Prevention (CDC) believes that e-cigarettes may cause some health hazards. For example, they may contain some harmful substances, such as formaldehyde, nicotine, etc., and may also pose a threat to the health of minors, especially some teenagers.
Regarding whether e-cigarettes will disappear by 2050, different people have different opinions. For details, please refer to the news released by authoritative organizations.