Smokers face a maximum three months in prison for lighting up in public places in Wales under a Private Member's Bill. The Bill, which is due to have its second reading on Friday, would give the National Assembly powers to enforce a ban and the right to determine how widespread it should be. In practice the proposal would be difficult to enforce because the National Assembly does not have power over the police force or the judicial system in Wales. Peter Hain, the Welsh Secretary and Commons Leader, conceded the Bill posed practical problems but said that the proposed legislation was more about keeping the issue at the top of the agenda than reaching the statute books.