The bill is S. 194, not S. 174, which is an ammunition background check.
At any rate, the bill was introduced last year, in the 112th session, and never made it out of committee. The present bill is the same, stuck in committee. I wouldn't get too excited about it passing, too many legislators from tobacco producing states see this as a death knell for their constituents (literally). Small farmers who derive most of their income from plots of tobacco are very politically active in those states.