Poppers consist of nitrites of nitrous acid (chemical). However, different poppers contain different nitrites.
Hexyl nitrite, pentyl nitrite and Canadian pentyl formula are the ingredients that are of least concern. These nitrites can also cause skin and eye damage. For this reason, contact of poppers with the eyes and skin in particular should be avoided.
Some nitrites are even carcinogenic. These nitrites are isopropyl nitrite and isobutyl nitrite. Hands off poppers with these ingredients. We do not sell such poppers on our site.