What are the side effects of vaping?

The side effects of e-cigarettes involve multiple body systems, ranging from acute respiratory irritation to long-term disease risks, and their impact is wider than many people expect.

 Respiratory System: From irritation to disease risks
This is the most direct and evidence-based system affected by e-cigarettes.

Short-term side effects mainly include coughing, dry throat, chest tightness, increased sputum, wheezing, and exercise-induced shortness of breath. It is worth noting that even non-smokers have a significantly increased risk of respiratory symptoms after using e-cigarettes (relative risk RR = 1.90).

Long-term risks are more serious. Studies have found "moderate certainty" evidence that non-smoking e-cigarette users have a higher risk of developing chronic obstructive pulmonary disease (COPD), asthma, lung inflammation, and damage. Additionally, there are reports of non-tumorous lung injuries, such as exogenous lipid pneumonia and diffuse alveolar hemorrhage.

❤️ Cardiovascular System: Acute functional disturbances
The impact of e-cigarettes on the cardiovascular system occurs immediately after a single use.

Blood pressure and heart rate: Even a 5-minute use of e-cigarettes can cause an increase in heart rate and blood pressure. This reaction is not related to whether the e-liquid contains nicotine.

Vascular function: Short-term use can observe impaired vascular endothelial function and increased arterial stiffness (measured by pulse wave velocity, etc.), which are risk factors for cardiovascular events.

 Immune System: Weakened defense
The e-cigarette aerosol triggers a widespread inflammatory response and damages immune cell function.

Function impairment: It impairs the chemotaxis, phagocytosis, and oxidative burst capabilities of neutrophils, while increasing the recruitment and activation of macrophages and dendritic cells.

Increased infection risk: This disrupts the epithelial barrier, increases susceptibility to bacterial and viral infections, and may enhance the formation of bacterial biofilms such as Staphylococcus aureus and Streptococcus pneumoniae.

Long-term consequences: The long-term consequences of these immune dysfunctions include chronic inflammatory diseases, increased risk of respiratory infections, and even the potential to induce autoimmune diseases. People who start using e-cigarettes at a young age face a higher likelihood of these risks.

Oral Health: Bacterial imbalance and tissue damage
E-cigarettes alter the oral environment and increase the risk of oral diseases.

Bacterial change: The oral microbiome of users undergoes significant changes, with a decrease in beneficial bacteria and an increase in bacteria related to inflammation and periodontal disease. This change is more pronounced in high-volatility users.

Clinical issues: Studies consistently show that e-cigarette use is associated with a higher prevalence of dental caries (cavities), increased risk of gingivitis and periodontal disease, and tooth sensitivity.

Nicotine Addiction and Brain Effects
This is the core addictive harm of e-cigarettes, particularly for teenagers.

High addiction: Nicotine is the main component of e-cigarettes and is highly addictive. Teenagers may show signs of addiction before starting regular use.

Damage to brain development: Brain development continues until approximately 25 years of age. Using nicotine during this period may cause persistent damage to brain regions related to attention, learning ability, mood, and impulse control.

Mental health: Nicotine exposure may exacerbate anxiety and depression symptoms. Users may feel anxious or agitated when not using, forming a dependence cycle.

Acute Pulmonary Injury (EVALI): An Urgent Condition to Watch Out For
EVALI (Electronic Vaping or E-cigarette Product Use-Related Pulmonary Injury) is a serious acute disease that has been widely identified since 2019. It is associated with the use of nicotine, THC, and CBD products, but vitamin E acetate (often illegally used as a thickener for THC e-liquid) is strongly associated.

If the following symptoms occur after using an e-cigarette, you must seek medical attention immediately:

Shortness of breath, difficulty breathing

Fever, coughing

Chest pain

Nausea, vomiting or diarrhea

Headache, dizziness

Summary
The side effects of e-cigarettes are real, multi-faceted and cumulative. It is not harmless vapor; its aerosol directly irritates the respiratory tract, disrupts cardiovascular function, weakens immune defense, alters oral microbiota, and due to its nicotine content, it is highly addictive, especially harmful to the brain development of teenagers. Although the long-term cancer risk of e-cigarettes still requires more research to fully clarify, the existing evidence is sufficient to show that its harm to the respiratory system and cardiovascular system is clear.