Our main responsibility in life is guide companies in how to deal with issues affecting their corporate public policy

Ronald Duchin, president MBD

Ms Carter accuses MBD of infiltrating and advising on environmental groups and non-governmental organisations, working against the US Food and Drug Administration (FDA), preparing notes for character assassinations of leading anti-tobacco figures, and undermining global tobacco control initiatives.

Tobacco giants which have been clients of MBD include Philip Morris and RJ Reynolds.

But Ronald Duchin, president of MBD refuted the accusations.

Guidance

Ms Carter said that although many organisations tried to further their cause through the use of public relations and "skilful tactics" but she wrote: "The difference is in the distinctly unscientific realm of morality and conscience.

"MBD are clearly pragmatic about reaching their "issue management" objectives and unconcerned about the impact they have on disempowered others."

Ronald Duchin told BBC News Online: "We are not a PR company, we are an issues management firm."

"Our main responsibility in life is guide companies in how to deal with issues affecting their corporate public policy."

He categorically denied infiltrating groups. "We have monitored, but not infiltrated in any circumstances."

But he did admit the firm provided helped companies put their side of the argument in negotiations such as the FCTC.

He added that the company was doing "nothing immoral" by advising companies selling a legal product.