One of the world's biggest tobacco firms, Philip Morris, has been accused of "staggering hypocrisy" over its new ad campaign that urges smokers to quit.
The Marlboro maker said the move was "an important next step" in its aim to "ultimately stop selling cigarettes".
But Cancer Research said the firm was simply trying to promote its smoking alternatives, such as heated tobacco.
"This is a staggering hypocrisy," it said, pointing out the firm still promotes smoking outside the UK.
"The best way Philip Morris could help people to stop smoking is to stop making cigarettes," George Butterworth, Cancer Research UK's tobacco policy manager said.
The charity said smoking was the leading preventable cause of cancer and it encouraged people to switch away completely from smoking, including through the use of e-cigarettes.
Health charity Action on Smoking and Health (Ash) also criticised the campaign - which is called Hold My Light and has been launched in a four-page wraparound on Monday's Daily Mirror - saying it was a way for Philip Morris to get around the UK's anti-tobacco advertising rules.
Most forms of tobacco advertising and promotion in the UK are banned, and rules introduced last year mean cigarettes and tobacco must be sold in plain green packets.
Deborah Arnott, chief executive of Ash, said Philip Morris was still advertising its Marlboro brand wherever it was legal to do so.
"The fact of the matter is that it can no longer do that in the UK, we're a dark market where all advertising, promotion and sponsorship is banned, and cigarettes are in plain packs.
"So instead Philip Morris is promoting the company name which is inextricably linked with Marlboro."
In the UK, it markets several alternatives to cigarettes, including a heated tobacco product, Iqos.
It also owns the Nicocig, Vivid and Mesh e-cigarette brands.
'It takes time'
The firm's managing director Peter Nixon said its new advertising campaign was "about supporting smokers in finding alternatives".
Asked why, if Philip Morris was so keen for smokers to quit, it did not simply stop making cigarettes and focus entirely on alternative products, he said it was because then smokers would then just switch to a rival product.
"Cigarettes still generate 87 percent of our business. We want to get to [smoke-free] as soon as possible, and we want to be selling alternatives, but it does take time."
Mr Nixon said the firm had invested over £4bn ($NZ7.93b) in developing alternative products to cigarettes.
The campaign suggests four ways to give up cigarettes, including going cold turkey, using nicotine patches, vaping and using heated tobacco products.
In July last year, the government set out a plan to make England, in effect, smoke-free in the next few decades. It aimed to cut smoking rates from 15.5 percent to 12 percent of the population by 2022.