I ended up in the ER after snorting contaminated DNM dope. Doctor described my illness as a walking pneumonia and so far I'm recovering well with antibiotics. Gonna be honest, I have huge nostrils and shit always ends up in my lungs no matter how fast or slow I take it in. I really didn't want to flush my dope so I figured out a new way to insufflate it. You just take your straw, plastic or rolled piece of paper, and put your dope inside it. With a loaded straw, stick it inside your nose past your nares and let the product drop down into your sinuses. Rub the side of your nostril to make sure the product sticks and then follow up with a small squirt of saline solution and you're done. Just don't let it drip. Doing it this way will prevent dope from getting into your lungs or accidentally swallowing it, plus you get more bang for your buck.
Or you could just bang it.