Heart rate amd breathing slow down, speech can become slurred, some people experience blurred or double vision. Most users experience dizziness, drowsiness and sometimes nausea. Repeated use or deep inhalation can cause confusion, loss of control and even loss of consciousness. Often the products containing the solvent contain other chemicals that can be harmful. Some products contain chemicals that are irritant or sometimes even corrosive.
Many industrial solvents are carbon based, like our bodies.
Take note of any warning symbols on the packaging. Most of the products are also inflammable. Smoking or using matches or a lighter could easily lead to an accident. Sniffing glue out of a plastic bag can cause suffocation. If you pass out the bag can remain stuck to your face.