After early gains, Imperial's shares slid by as much as 2.6 percent.
The shares slid 4.6pc to £13.55 in early trading.
Boeing's shares, after hitting a 52-week peak of $54 in late January, have been sliding steadily.
The shares slid almost 31 percent in response to the news.
The company's shares slid an additional 22 percent in Paris, closing at 13.90 euros.
The shares have slid 20 percent since July 17, when they hit a 52-week high of $109.
But its share of the market slid when it sought payment in hard currency, a practice continued by Russia.
The grey market resumed on May 12th, after the rights issue was priced; the shares slid further.
Unfortunately this was not the bottom and the shares slid below 400p, but have since recovered.
But in the fourth quarter, its share slid to 24 percent.