Huffing refers to the act of breathing in substances or fumes to get high. It can be dangerous because these chemicals or gases can harm your body and brain. Full definition
Do I put some stock in huffing and puffing? (lawyerist.com)
There is a lot of huffing from the audience at this. (theguardian.com)
Those of us who love and lived Reality Bites know that it's not the best movie, with not the best acting, and we will tell that to the hater who huffs about how they don't understand why Reality Bites came to mean what it means that they're not illuminating for us anything new. (laineygossip.com)