Ich recently thought about how one could improve the absorption efficiency for toxic parts of the smoke. Water and activated carbon are good to clean gas or smoke from certain gases and similar volatile substances (sadly terpenes and other positive elements too, at least with activated carbon) but they are not really efficient to bind tar and other non-water soluble constituents although carbon can bind some very toxic things like nitrates, nitrogen mono oxide and many more.
I thought about adding some kind of oil or maybe propylene glycol to the water as it gets very dispersed after a few smokes as the bubbles with water distribute it even though it's not soluble and after a certain time it also stays completely mixed with water, which could be because of a reaction with the smoke so something is filtered that keeps the oil and water together although I don't know what exactly this/those substances could be but I guess the oil will make it more likely that more tar molecules and other fat-soluble stuff will be absorbed.
I also read a research paper (I'll link it here if I find it again) that states that normal cellulose-filters for cigarettes that are treated with sodium bicarbonate have a greater capacity to absorb smoke particles although I couldn't really understand what kind of reaction is caused by the bicarbonate. On the other side it could cause the smoke to have a higher PH and convert the nicotine into it's free base which is the most toxic form (although it gives a quite strong nicotine rush, you can feel it when you smoke tobaccos with much freebase nicotine like American Spirit that was analyzed once) but from my experiments it seems that the bicarbonate makes the smoke a bit smoother and the pipe less smelly. (I use two activated carbon adapters and a pre-cooler so they don't get full of ash and can be used much longer. This is a really good combination for a smooth smoke but I guess it takes quite a few good terpenes away, I only smoke the synthetic noids of which some are so cheap that I don't care how much of the ingredient is filtered)
I thought about adding some kind of oil or maybe propylene glycol to the water as it gets very dispersed after a few smokes as the bubbles with water distribute it even though it's not soluble and after a certain time it also stays completely mixed with water, which could be because of a reaction with the smoke so something is filtered that keeps the oil and water together although I don't know what exactly this/those substances could be but I guess the oil will make it more likely that more tar molecules and other fat-soluble stuff will be absorbed.
I also read a research paper (I'll link it here if I find it again) that states that normal cellulose-filters for cigarettes that are treated with sodium bicarbonate have a greater capacity to absorb smoke particles although I couldn't really understand what kind of reaction is caused by the bicarbonate. On the other side it could cause the smoke to have a higher PH and convert the nicotine into it's free base which is the most toxic form (although it gives a quite strong nicotine rush, you can feel it when you smoke tobaccos with much freebase nicotine like American Spirit that was analyzed once) but from my experiments it seems that the bicarbonate makes the smoke a bit smoother and the pipe less smelly. (I use two activated carbon adapters and a pre-cooler so they don't get full of ash and can be used much longer. This is a really good combination for a smooth smoke but I guess it takes quite a few good terpenes away, I only smoke the synthetic noids of which some are so cheap that I don't care how much of the ingredient is filtered)
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