ALG members are currently writing a private bill that makes smoking in enclosed public spaces illegal after leaders pledged to back a ban at a meeting last week.
The bill seeks to give local authorities stringent powers to clamp down on people lighting up where they force others to breathe their smoke.
ALG chairman Sir Robin Wales said: ‘We must think about the health of people who work in these places. It is estimated that in London one million non-smoking workers are exposed to tobacco smoke.’
Breathing in secondary smoke dramatically increases the risk of heart and lung disease, according to research compiled by the Scientific Committee on Tobacco and Health, which was unveiled by the Government last week.
