Guess I can be considered lucky, as I never like to test my limits of my body vs a drug, that's not to say I don't do huge dose over the course of whole night time to time, I do. But I always wait good enough time and only if I'm sure the next redose will be fine I do it. Been using drugs for 8 years now, mostly weed or booze or stims and I think I never came even close to thinking about ER.
OK I lie. I did 2 or 3 times when I was younger and underestimated mephedrones overstimulation potential, well that was 4 years ago. Now I really try to only get so high that drug naive people can't even see I'm high. I don't seek the ultimate euphoria out of anything because it's usually not worth it, as I can see on my local friends who take drugs regularly.
I hope I won't ever touch opiates because from what I read it's easier to get close to OD area with them.