Probably a couple of times when taking drugs. Not literally 'going to die' but definitely being so 'fucked up' the overwhelming feelings were way too much, vomiting, eyes rolling, just not a nice feeling thinking back
I dunno why I or many other teenagers spent many a weekend taking drugs like mdma, cocaine, speed, and have come to believe only people with extremely low self esteem and security take drugs. I'm one to talk, but I can't help to think in the last couple of years the reason I haven't touched anything is because I must have more respect for myself and my life nowadays.
It must have changed my perspective completely when myself, cousin and many friends were at a party. I was after taking a few pills and was absolutely fucked. As in dunno what I'm doing at all fucked, apparently I gave my cousin pills (he always took them also) and next thing he was on the floor having a fit of some sort, and there was an ambulance called, I was so messed up I didn't even realise until throughout the night while coming down off these drugs that my own cousin was in hospital because of a PARTY. I couldn't even answer the phone to my aunt which also shows how selfish I am. He nearly died
My uncle said while picking us up to bring us to the hospital 'it's not worth the cheap thrill' nothing will stick with me more.
My cousin and me were like brother and sister and continued to hang around for months after until one night he was so high and paranoid he presumed I had stolen his drugs, kicked me out of his house and refused to talk to me for months, blocked me on everything. It hurts so much. I love him so much.
That's what drugs do, tear relationships apart and the odds of nearly dying are way too high for a 'cheap thrill' 
I will never forget my cousins face when he woke in a hospital bed with his mum and me next to him. The dread on his face. That's enough to scare me away from anything mind altering ever again