Absolutely not true. The cigarette was dropped in a lavatory trash can and fell between the can and the wall.
And for God’s sake. I flew on flights where smoking was permitted in the mid 1980s. I reeked of cigarette smoke, had holes in my skirt from lit cigarettes and had horrible chest pains from filtering the cigarette smoke through my lungs.
Perhaps you need to give the information you have to the NTSB so they can revise their report.