Worst thing you ever inhaled?

I inhaled a Minstrel once.

A gang of us were knacker drinking in a partially demolished old building in the middle of town on a particullarly cold evening so we
decided to light a fire.

Just as the fire got going ,one of the lads disappeared for a few minutes.Nobody was really taking much notice when he returned with an old paint tin and placed it in the middle of the fire.
Within a few minutes there was a loud pop and the most vile,disgusting smell filled the air around our sheebeen.

It was one of those smells which almost made you pass out when it hit your nostrils.
Turns out there was some paint left in the tin and the dirty bastard had shat and pissed into it and resealed it before bringing the vile concoction to the boil in his improvised pressure cooker.

We ran for cover with our flaggons in hand as the paint/sh1te/piss mixture began to splatter everywhere.
The air in the town center filled with the disgusting aroma ,with everone we met asking "jesus lads,whats that smell?"
30 years later I still feel sick when I think about it.
Dirty Bastard.

It's a toss up between a dead rat in someone's floorboards and the bacterium Clostridium Difficile.

Neither are ones I intended to inhale but the smell just hits you.

Holy hell

When I worked as a cashier an auld cracked farmer used to come into my workplace every day.
You'd know he was in the vicinity by the stink of piss and unwashed body suddenly pervading the air, but on top of that he'd gotten wet gangrene in two of his fingers.
He also kept them wrapped in the filthiest pus stained piece of bandage I've ever seen .
He'd come to me to pay for his goods with his smelly fingers handing me the cash.
I used to try to hold my breath to avoid the stink but it was so bad there was no escaping it.

Walking into a plant room.in work where somebody had silenced a gas alarm
during the night and told no one.

Never forget getting a whack of ammonia that dropped me to the floor luckily i came out of there on my knees.

Full oxygen masks and all were needed just to get into the room to find and fix the leak.

The dead rat, rotting down nicely in the kitchen drawer that time was a bit tangy.

The pot of steamed sprout peelings, lost for a month in the kitchen cupboard? That got 'emotional'.

But, the all time contender to leave Alf's Dog Schit Steam standing was the time I got Mink Gland Lure in my mouth! That was a special kind of special.

Thankfully, it made me go blind. Else, I'd have got hold of my gun and shot myself.

a friend put chilies in the mircowave without puncturing them and they popped.I went over,opened the door and mistakely took in a lung full of the vapour.it was so overwhelming that I threw up.