Do THC vape pens smell like weed?Can it be smell proof?

In simple terms, the smell of THC cartridges purchased through legal channels is usually much lower than that of burning raw cannabis plants. But this does not mean that it is "odorless" or "untraceable".
?? Characteristics of the smell of THC cartridges
The smell is mild and short-lived: THC cartridges usually contain highly purified cannabis oil or concentrates, rather than raw dried leaves. Since there is no combustion process, it produces an aerosolized vapor instead of a burning smoke. The distinctive "marijuana smell" is much weaker than that of burning smoke and dissipates much faster.
The source of the odor is different: The odor you smell mainly comes from the terpenes (the compounds that provide flavor) remaining in the cannabis oil, as well as possible additives. For those unfamiliar with it, this odor may not be as easily recognizable as that of traditional cannabis cigarettes.
?? Regarding "Odor Prevention"
THC cartridges cannot achieve complete "odor prevention".
Instant odor: During the moment of inhalation and exhalation, people around may still detect a faint, somewhat similar odor to marijuana or specific herbs/chemicals.
Can be detected: High-tech air quality sensors are capable of specifically detecting the aerosol particles and chemicals produced by e-cigarettes and THC. Some commercial establishments (such as hospitals and schools) have deployed such devices. Even people might spray other odors (such as cologne) in an attempt to cover it up, and this behavior can also be identified by the algorithm.
Equipment and the cartridge itself: If the cartridge itself is not sealed properly, it may also emit a slight odor.
⚠️ Alerting Risks
The illegal electronic cigarettes currently circulating in the market carry extremely high risks. THC cartridges are among the most risky products. Many products of unknown origin are designed to mimic the "high" effect and are often illegally added with synthetic cannabinoids and other potent and highly harmful chemicals. Consuming such products may lead to serious health problems.
If you ask a question out of curiosity, please make sure you are aware of the risks involved; if you need to verify the authenticity and safety of a product, in addition to self-checking through clues such as smell, the most reliable method is to contact the local tobacco monopoly bureau or a qualified third-party testing institution for professional analysis.