Most of the time, meth is odorless and it is believed untraceable by the human nose. However, methamphetamines may give off a faint aroma. The smell of meth is similar to nail polish remover containing acetone, rotten eggs, cat urine, or burnt plastic. This is due to the chemicals that are used to cook meth. Methamphetamine vapors are extremely harmful to a person. The vapors can cause illness, death, and/or injury to anyone who is exposed to them.