You can purchase fake cigarettes that look fairly real and can even puff out a bit of "smoke" (talcum powder) when a small bit of air is exhaled through it.  They are very inexpensive and can be purchased through Theatre House.  They have a bit of "ash" on the end and a bit of red shiney paper that glows.  You can even fake lighting it with a real lighter. 

Be very careful about changing or deleting lines without permission from the playwright or licensing house.  (You're new to this Board, and maybe haven't had a chance to view the LENGTHY and ENERGETIC discussion on this very subject.)  It might go unnoticed, but you also might open yourself up to lawsuits, be prohibited from ever doing scripts from that publisher or playwright, or have your show closed down before it has a chance to open.  It has happened in the past......big brother really is watching!