The British Heart Foundation's director of policy and communications, Betty McBride, said: "Tobacco advertising is rightly banned in the UK, yet current glitzy packaging clearly still advertises tobacco on the cigarette box.
"It's an absurd loophole the tobacco industry takes full advantage of to lure in new young smokers."
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Thousands of people have linked hands on Westminster Bridge in a show of solidarity - one week after the terror attack in the capital.
PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Engineering firm CH2M won the £170 million contract but have pulled out of phase two of the project over alleged conflicts of interest.