To the people saying a heroin overdose would be terrifying.... Seriously?? I'm not proud of having overdosed before but misinformation drives me insane. Not only have I od'd but I've seen several and not a single one (of those that lived of course) said they were aware of suffocation or that it was painful or scary. In fact, most said it was peaceful and that being REVIVED was the painful horrifying part. I'm not advocating suicide or drug use but come on.... An oxygen depleted brain actually creates a sense of euphoria. Why isn't anyone else calling BS on the "being present and aware of your own terrifying suffocation" guy?