I have been away from there for a while but this used to be a good place, it is not downtown though. I don't know of one downtown but somebody else might. I would call them and check because they have some new smoking laws too.
The Tobacco Merchant
Location: 1220 Bower Parkway
Suite E4
Columbia, SC 29212
Lounge Hours: Monday-Saturday 10am-9pm
Sunday 1:30pm-6pm
Phone Number: (803) 749-5499
Web Site:
www.thetobaccomerchant.net/