Will addicts eventually end up ODing?

I have a fear of overdosing, I do many drugs. Shrooms, meth, cocaine, ecstasy, oxy & xans.. I don’t mix them though, I space out my drug use. Sometimes I let my use get out of control but, i always lock in before it gets bad. My question to you guys is .. do you think that addicts while eventually overdose one day? Even if they space out usage & take a low dosage of whatever drug it is? I want to know your opinions !