![Berlin, Germany. 01st Aug, 2018. A young man prepares a joint from a marijuana-tobacco blend. In this joint, he uses an activated carbon filter instead of a normal filter. Credit: Gerald Matzka/dpa-Zentralbild/ZB/dpa/Alamy Berlin, Germany. 01st Aug, 2018. A young man prepares a joint from a marijuana-tobacco blend. In this joint, he uses an activated carbon filter instead of a normal filter. Credit: Gerald Matzka/dpa-Zentralbild/ZB/dpa/Alamy](https://c8.alamy.com/comp/PD36NB/berlin-germany-01st-aug-2018-a-young-man-prepares-a-joint-from-a-marijuana-tobacco-blend-in-this-joint-he-uses-an-activated-carbon-filter-instead-of-a-normal-filter-credit-gerald-matzkadpa-zentralbildzbdpaalamy-live-news-PD36NB.jpg)
Berlin, Germany. 01st Aug, 2018. A young man prepares a joint from a marijuana-tobacco blend. In this joint, he uses an activated carbon filter instead of a normal filter. Credit: Gerald Matzka/dpa-Zentralbild/ZB/dpa/Alamy
![Cleaner smoke thanks to Activated Carbon Filters - BUSHPLANET Headshop | Growshop | CBD | Vaporizer | Seeds Cleaner smoke thanks to Activated Carbon Filters - BUSHPLANET Headshop | Growshop | CBD | Vaporizer | Seeds](https://www.bushplanet.com/media/image/product/21914/sm/mo05005si.png)
Cleaner smoke thanks to Activated Carbon Filters - BUSHPLANET Headshop | Growshop | CBD | Vaporizer | Seeds
![Smoking a joint with an active charcoal filter and i noticed some kind of black oil on my fingers. What is this? : r/trees Smoking a joint with an active charcoal filter and i noticed some kind of black oil on my fingers. What is this? : r/trees](https://preview.redd.it/smoking-a-joint-with-an-active-charcoal-filter-and-i-v0-gfb0gyr9y4e81.jpg?auto=webp&s=88cff00e0e1a3c183d07f26a7d1f13512755ddc3)
Smoking a joint with an active charcoal filter and i noticed some kind of black oil on my fingers. What is this? : r/trees
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