Randomised controlled trial of tailored support to increase physical activity and reduce smoking in smokers not immediately ready to quit: protocol for the Trial of physical Activi... by Taylor, A, Thompson, TP, Ussher, M, Aveyard, P, Murray, RL, Harris, T, Creanor, S, Green, C, Streeter, AJ, Chynoweth, J, Ingram, W, Greaves, CJ, Hancocks, H, Snowsill, T, Callaghan, L, Price, L, Horrell, J, King, J, Gude, A, George, M, Wahlich, C, Hamilton, L, Cheema, K, Campbell, S, Preece, D