By Ashley Cowburn & Dave Burke Rishi Sunak faces a key vote today on his plans to raise the legal age to buy tobacco up by “one year, every year” to stop youngsters taking up smoking. If it becomes law, the Tobacco and Vapes Bill – which was included in the King’s Speech – will deliver a hammer blow to the tobacco industry. The PM sees the measure as a key part of his long-term legacy as he bids to “stamp out smoking for good”. But the Tory leader faces opposition to the Bill from within his own party. Ex-PM Liz Truss has hit out at the “unconservative” proposals she says were previously binne…