Lynton Crosby, whose lobbying firm is reported to have worked for tobacco giant Philip Morris, said any suggestion he had used his position as an adviser improperly was "simply false".
In a statement issued today by his company CTF Partners, Crosby said:
The Prime Minister has repeatedly and clearly said that I have never lobbied him on anything, including on the issue of tobacco or plain packaging of cigarettes.
What the PM said should be enough for any ordinary person but to avoid any doubt or speculation, let me be clear.
At no time have I had any conversation or discussion with or lobbied the Prime Minister, or indeed the Health Secretary or the health minister, on plain packaging or tobacco issues.
Indeed, any claim that I have sought to improperly use my position as part-time campaign adviser to the Conservative Party is simply false.
More top news
Staying blustery for the next 24 hours with strong winds driving some rain, sleet and snow from west to east tonight.
The mother of murdered Boris Nemstov's girlfriend is worried her daughter is being treated as if she had something to do with the killing.
Student Charlie Mann was jailed for 16 months for the attack on his mother at their family home while high on Meow Meow.