Definitely inspired by a recent run in with some not so good incense. Ugh!
1. It smells like chemicals/paint thinner. The worst!
2. You get a headache from the smell. You are not supposed to get headaches from good quality incense
3. Your stomach feels queasy afterwards. Low quality incense diffused through the air in a smokey draft is a cocktail for a stomach ache. Stop using immediately!
4. Aroma is harsh to the olfactory senses. While some incenses are created harsher than others, it is generally the lower quality ones that have a distinct harshness to them.