If BHO is fucking with your lungs it is underperged, imo and full of butane over whatever solvent was used for extraction. When you vape bho, there is no combustion because the plant matter has been removed so it should be easier on your lungs than anything. In case anyone is interested, this is my process for making bho which I've been doing for a little over a year.
Material:
Stainless steel turkey baster or glass extraction tube (no pvc or other crap)
High Quality Butane such as Vector or Colibri
Glass Pyrex Dish
A pot to hold water
Buds
Unbleached Coffee Filter
Clamp
Do this shit outside so you don't blow up your house. Butane pools and can be sucked into various electronics or appliances and cause explosions.
Make sure your nugs are dry. They do not have to crumble, but moisture will impede the penetration of the butane threw your buds.
The water you use can be as hot as your tap will go, there should be some steam. If you want to be precise 150 is a good temperature. Anything over 170 and you risk degrading your oil.
When using nugs do not grind them. It may increase your yield somewhat but can leave plant matter in your oil or leave it with a green look/taste. Whole nugs will leave you with extremely potent and tastey errls. Pack your extraction tube with your dry nugs evenly and pack them in good. You do not want pockets of air in the tube as it will allow the butane to convert into gas and lose pressure, which is bad. So put some effort into packing the tube, it may take a few runs to get it close to perfect but it helps increase your yield. If you use a chop stick or scewer to push the bud out of the tube when you're done and it comes out in a solid chunk you are on the right path.
Place the unbleached coffee filter over the end where you butane will be exiting the tube and use the stainless steel clamp to hold it on. You want it to be on tight as well, as it will keep from any pressure from being lost and once again increase your yield. It also reduces the risk of a tear in the filter. To combat tears you can use two filters or place a fine stainless steel screen over the filter. If you're using a stainless steel tube use one of the adapters that come with vector and the butane nozzle will fit more tightly. If you notice and butane coming out of your entery point then you're losing pressure and yield.
Now that you're tube is packed your about ready to spray. Fill your pot with the water and place a CLEAN pyrex dish over the pot. Water should be contacting the entire undersurface of your pyrex dish. The tube will get cold from the butane so hold it with a rag something similar. I also wear glasses in case of a blow out, you do not want chunks of butane laden weed in your eyes. Take the pot, dish, tube, and butane outside. NEVER EXTRACT INSIDE. Insert the butane nozzle into your tube and start spraying. Keep your tube as close to the dish as possible so there is no splatter. One can of butane is good for about 1 oz of nugs, and a fully packed baster should hold about one oz. I cut down my baster to hold between 5-7 grams.
Keep spraying until the butane comes out clear. Wait until the pool of butane has evaporated and switch the water for new hot water as it will have most likely cooled by this point. Purge for 10-15 mins per gram of oil. All the while ensure that your water stays consistently hot. And do not think you can speed this process by increasing the temps and achieve a quality product, it will degrade the taste and color of your oil.
While your oil is purging if you notice that any of the bubbles are not popping you can help by applying a very small flame to them but be careful to not vape the oil in the process. If that worries you then you can heat a pin and use the heated pin to pop the bubbles. Once your hot water bath purge is complete you can stick the pyrex into a pre heated oven if you would like. Put the oven on the lowest setting, 150-160. Most ovens don't go this low so use a toaster oven or just turn your oven on for a min then turn it off. The heat will help purge any butane that might be left behind, and make it easier to scrape your oil. If I put mine in the oven it's only for a few minutes, keep a very watchful eye on it at all times if you're using an oven.
Scrape the oil with a clean razor blade and put it in a dish. It's ready to be vaped.
And I know this isn't the BHO forum, but it's great stuff when prepared/purged properly. My lungs feel better after a week of strictly bho and no buds. I vape it from a HashMasta-Kut rig that is about the size of a golf ball and holds no more than a cap full of water.