1. Abstract

VAPEPIE has developed a smokeless e-liquid formulation that significantly reduces visible vapor during use. The innovation relies on a simple yet effective combination of propylene glycol (PG) and food-grade flavor essences, excluding glycerin — the primary source of thick vapor in traditional e-liquids.

Through optimized proportions and a refined mixing process, the resulting e-liquid provides a nearly invisible exhaled vapor, ensuring a clean, discreet, and comfortable vaping experience. Independent trials demonstrated over 93% reduction in visible vapor while preserving complete aroma integrity and smooth inhalation comfort.

2. Introduction

With the global population of smokers continuing to rise, tobacco-related health risks and secondhand smoke exposure remain major public health concerns. The emergence of electronic cigarettes has offered a viable harm-reduction alternative, replacing combustion-based smoking with vaporization.

However, most e-liquids still generate dense, visible vapor clouds that spread odor and fine particles into surrounding air, particularly in public or indoor spaces. This creates discomfort for bystanders and contributes to air quality degradation.

As public awareness of health and environmental quality increases, the vaping industry faces growing pressure to innovate toward cleaner, more sustainable, and socially responsible solutions. Addressing this need, VAPEPIE has pioneered a new class of smokeless e-liquid designed to eliminate visible vapor while maintaining flavor and satisfaction.

3. Research Objective

The objective of this research is to develop and validate a smokeless e-liquid formulation that:

• Produces little to no visible vapor upon exhalation.
• Preserves authentic flavor integrity and user comfort.
• Reduces environmental and secondhand exposure impacts.
• Maintains compatibility with existing vape hardware.

4. Materials and Composition

The VAPEPIE smokeless e-liquid consists primarily of:

Example Formulations:

• 18 parts flavor essence, 82 parts PG
• 15 parts flavor essence, 80 parts PG
• 12 parts flavor essence, 85 parts PG
• 23 parts flavor essence, 73 parts PG

All flavor essences used are food-grade, dual-soluble (oil and water), and available in multiple profiles such as fruit, coffee, vanilla, chocolate, jasmine, and rose.

Propylene Glycol (C₃H₈O₂) is a colorless, nearly odorless viscous liquid with mild sweetness and high solubility for flavor compounds, ensuring stable dispersion and consistent vaporization performance.

5. Preparation Method

The preparation process involves the following key steps:

S1. Ingredient Mixing:

Measure the desired ratios of flavor essence (10–30 parts) and propylene glycol (70–90 parts) and pour them into a clean stainless-steel or glass container.

S2. Mechanical Stirring:

Use a laboratory-grade stirrer to mix the ingredients thoroughly until a clear, homogeneous solution is obtained. The strong solubility of PG ensures full integration of the flavor compounds.

S3. Resting Period:

Allow the mixture to stand at room temperature for 5–20 minutes to achieve stability and uniform distribution.

The resulting product is the VAPEPIE Smokeless E-Liquid, ready for direct use in standard vaping devices (3.3–4.2V, 8–10W).

6. Experimental Results and Discussion

To validate the effectiveness and user experience of the VAPEPIE smokeless formula, three primary tests were conducted.

6.1 Vapor Visibility Test

Method:

30 participants used various commercial vape devices prefilled with the VAPEPIE smokeless e-liquid (10g each).

Results:

• 28 out of 30 users exhaled no visible vapor.
• 2 users exhaled faint, minimal mist visible under strong light.

Conclusion:

The VAPEPIE formulation achieved a 93% effective reduction in visible vapor, confirming that PG-only formulations can maintain aerosol delivery without forming dense clouds.

6.2 User Comfort Evaluation

Objective: To assess inhalation smoothness, throat hit, and post-use comfort.

Results:

• 27 participants reported a pleasant, clean, and neutral taste.
• 3 reported slightly dry sensation during extended use.

Conclusion:

The smokeless e-liquid maintained excellent smoothness and comfort, achieving a balanced experience comparable to mild traditional vaping but without irritation or residue.

6.3 Flavor Retention Analysis

Objective: To evaluate aroma persistence and authenticity after vaporization.

Results:

• 29 participants reported complete aroma retention and a lightly sweet aftertaste.
• 1 reported mild flavor distortion, attributed to device temperature variance.

Conclusion:

The VAPEPIE smokeless e-liquid successfully preserves flavor integrity, ensuring a satisfying sensory experience even without glycerin-based vapor density.

7. Advantages and Innovation Highlights

Key Benefits:

• Discreet Use: Ideal for indoor, office, or public environments.
• Eco-Friendly: Reduces secondhand vapor and air contamination.
• Clean Aroma: Preserves authentic scent without residual haze.
• Comfort-Oriented: Smooth inhale and balanced throat feel.
• Simple Composition: Fewer ingredients, higher purity and safety.

8.VAPEPE smokeless vape finished product display

Specifications

• Model: Vapepie Smokeless Vape
• E-liquid Capacity: 13ml + 9ml (22ml total)
• Puffs: 40000 Puffs
• Battery Capacity: 900mAh (Rechargeable, Type-C)
• Nicotine Strength: 50mg/ml
• Display: Smart LED screen showing power & e-liquid levels
• Coil Resistance: Smokeless Mode: 1.12Ω Mesh / Normal Mode: 0.6Ω Mesh
• Modes: Smokeless Mode / Boost Mode / ECO Mode
• Charging Time: Approx. 35–45 minutes (supports pass-through charging)

9. Conclusion

VAPEPIE Smokeless E-Liquid Technology represents a significant advancement in clean vaping innovation.

By optimizing the proportion of propylene glycol and flavor essence, the formulation achieves:

• Minimal visible vapor emission
• High aroma fidelity
• Excellent user comfort and satisfaction

This breakthrough not only addresses environmental and social concerns around vaping but also redefines the future direction of responsible e-liquid development — toward healthier, cleaner, and more considerate vaping experiences.