lol
I've been there so many times myself & it drives you mad as you are sure you had it & now cannot find it to save your life.
For some reason if I have really been hitting the zopiclone then have a tot I get it so badly, I have searched for ages looking for the damn fag & then you notice you smoked it & the end is in the ashtray.
The very first time I ever did gear I went on the nod & dropped a cigarette down the side of the seat & I only woke up due to the seat really smoldering, I had to run & get a cup of water to put the damn thing out, the seat was some really old piece of crap Noah used on the ark so it wasn't upto date with EU safety laws so how it dsidsnt just burst into flames is beyond me.
If you have ever done Datura you get the phantom cigarette really bad, that stuff though isn't a good thing to do though, Jamestown in the US is named after a group of poor blokes that munched up a bunch of the plants, went batshit insane & all died from that foul stuff.