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Your medical cannabis journey simplified: find partnered dispensaries, explore pricing options, earn rewards, and get answers to FAQs, all in one spot.
December 22, 2020 11:30 am ETEstimated Read Time: 5 Minutes
First-hand smoke is when you are directly inhaling smoke, while second-hand smoke is when smoke is indirectly inhaled by those sharing the space with someone smoking. If you didn’t know, there is also something called third hand smoke. Third hand smoke is when the smoke residue is left on surfaces. If you know someone who heavily smokes cigarettes, you know exactly what third hand smoke is when you smell it in their car and home. The same can also be said for those who smoke cannabis. Your hands can smell a lot like cannabis after smoking and the solution is a simple hand wash. But what is the solution to reducing the chemicals and compounds that smoking cannabis can leave behind on surfaces? Well, researchers have found that it can be reduced by ozone.
Third Hand Smoke (THS) Explained
Third hand smoke (THS) is reactive chemicals that either remain in the air or are deposited onto surfaces such as walls, windows, clothing, and upholstery. Most of what is known about THS stems from tobacco consumption. Third hand smoke from cannabis is not as intricately studied and cannabis is chemically distinct from tobacco- in other words, the chemicals and compounds in cannabis and tobacco are unique to their own. People can be exposed to third hand smoke through their skin, through eating contaminated foods, or by even breathing in the air surrounding contamination.
What is Ozone?
Ozone, or trioxygen, is an inorganic molecule in the form of a pale blue gas, which is formed from dioxygen when exposed to ultraviolet (UV) light and electrical discharge within the Earth’s atmosphere. Ozone can be found in small concentrations throughout the atmosphere, which can be inside or outside, and the highest quantities can be found in the ozone layer of the stratosphere. The ozone layer has the highest concentration of trioxygen because it absorbs most of the UV radiation from the sun- thus serving as a layer of protection between the sun’s UV radiation and the Earth.
The Role of Ozone in Reducing Third Hand Smoke
In order to get an understanding of how the ozone may react with the psychoactive cannabis compounds such as tetrahydrocannabinol (THC) and cannabidiol (CBD),researchers conducted an experiment. The experiment involved coating a glass and cotton cloth with a THC solution in order to simulate windows and clothing. Then they were exposed to concentrations of ozone that one may find in the indoor air (atmosphere). The researchers found that the reaction between cannabis smoke and the concentrations of ozone produced “new compounds, which they characterized for the first time ” according to the team of researchers.
ACS explained that “over time, the amount of THC on glass and cotton decreased, while the quantities of three THC oxidation products increased”. The team of researchers identified the THC oxidation products as epoxide, dicarbonyl, and secondary ozonide. The significance behind this revelation lays in the fact that third hand smoke remains long after a person has stopped smoking.
More on the Research
Additionally to testing concentrations of ozone on THC-coated cotton cloth and glass, the team made use of a smoking machine to deposit cannabis smoke onto more cotton. The results revealed that the same three THC oxidation products continued to form at “roughly the same” rate as those observed in the THC-coated cotton cloth. The ACS explains that,
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“Nicotine is semi-volatile and reacts with other chemicals on surfaces, producing new compounds that, if volatile, can also become airborne” but that due to “the low volatility of THC and its oxidation products, the compounds are unlikely to be emitted to the air where they could be inhaled in as large amounts as nicotine”.
The researchers, Aaron Wylie and Jonathan Abbatt recognized the difference between third hand smoke containing nicotine and that containing cannabis, which is why they wanted to classify the compounds formed when THC on surfaces reacts to the ozone in the air. The conclusion of the research was that the quantity of THC decreased over time as it was exposed to the concentrations of the ozone. Since third hand smoke tends to linger around, it is important to understand that one could be exposed to the cannabinoids by touching a surface contaminated by cannabis smoke and then licking fingers, for example. By exposing THC to ozone, this risk reduces over time. So it’s great to know that ozone is useful for reducing the THS from cannabis but what can we do to reduce third hand smoke (THS) from homes faster?
What You Can do to Reduce Third Hand Smoke in the Home
The Thirdhand Smoke Resource Center explains that more effective methods of reducing THS are still being researched but that they are certain of the following:
Vigorous cleaning can help reduce third hand smoke but for the best outcome, vigorous cleaning would need to be frequent.
Certain types of paint trap third hand smoke on walls, but this is still under investigation for more clarity.
Masking the smell with fragrant sprays and incense does NOT help, it only adds compounds to the air.
Smoking in a properly ventilated environment may help, especially with an extractor fan but this is also still under investigation.
As it stands now, ozone is one of the more certain manners of reducing chemicals from cannabis smoke on surfaces. Perhaps the best approach would be to combine the current suggestions of reduction for the safest outcome and in the best interest of your loved ones.
Chane Leigh, aka The Bud Fairy, is a South African cannabis advocate and enthusiast with a firey personality and a thirst for travel. She loves to educate people and to question the norms.
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The statements made regarding cannabis products on this website have not been evaluated by the Food and Drug Administration (FDA). Cannabis is not an FDA-approved substance and is still illegal under federal law. The information provided on this website is intended for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. It is not intended as medical advice and should not be considered as a substitute for advice from a healthcare professional. We strongly recommend that you consult with a physician or other qualified healthcare provider before using any cannabis products. The use of any information provided on this website is solely at your own risk.