IL1B and lung cancer: -Protective effect of variant G-allele of rs1143633 in smoking subgroup of >20 years-Association of IL1B SNP rs1143633 with lower risk of lung cancer-Association of IL1B SNP rs3136558 and haplotype4 consisting of IL1B htSNPs (rs1143633A-rs3136558C-rs1143630A) with increased risk of lung cancer