It depends on the grade. High end Eleiko, Ivanko, York, Etc..... stuff doesn't smell. The medium grade stuff like the York training bumpers and stuff like that might smell rubbery for a few weeks when new or if you really get close and sniff around. The really cheap Chinese stuff can have a rubber smell that lasts years/forever.
Most guys leave the stuff outside for a few days or wipe it down with fabreeze, that helps a bit.