Smith was diagnosed with stage four colorectal cancer in 2019 and sadly passed away on Thursday.
Capped 61 times by his country, the inspirational ex-prop was inducted into the Scottish Rugby Hall of Fame last year.
Smith played a big part in the 1997 Lions series win in South Africa and toured Australia four years later, becoming the only Scottish player to have played in six consecutive Lions Tests.
Ian McGeechan, who coached Smith along with Jim Telfer in the Lions win over the Springboks, described him as "the greatest Scotland player of the professional era."
Smith played his club rugby for Glasgow Caledonia – now Glasgow Warriors – and Brive before joining Northampton Saints in 2001.