It is possible to overdose on inhalants, which occurs when a person inhales a toxic amount. This can be fatal, causing the heart to stop, seizures, and even coma. The products used as inhalant drugs are often highly concentrated, and users concentrate them further with paper bags. This can make overdosing easy and a serious risk of experimenting with this kind of drug abuse. Called sudden sniffing death, even someone using an inhalant for the first time is at risk of dying immediately as a result of the heart stopping.