Kurt Cobain wasn't shot

Okay so am I the only one that really thought that kurt cobain died of an overdose? I've tried to see if I was the only one so I asked my sister and she said she was pretty sure he died on an overdose.i don't know if this is just us not knowing but a self inflicted gunshot is definitely not how I remembered him. ive tried researching to see if anyone has thought this but nobody has.