Just a tip for my fellow nicotine addicts...
For pack-a-day smokers the long flight can be uncomfortable. I packed some nicotine lozenges and did just fine, though they gave me heartburn and the hiccups.
if you want to smoke the local cigarettes, Gitanes is pronounced with a soft "g" like zhee-tans, not Gee-tans. the poor guy at the Tabac had no idea what I was saying.
You will also be asked if you want filters. Just say Oui, si'l vous plait. Buying tobacco is the one thing that seems to be missing from every phrasebook and wasn't covered in my two semesters of French.
One little piece of culture shock - I didn't get a single nasty look for smoking outside (indoor smoking is banned now, but it seems to be barely enforced).
Disclaimer - smoking is a filthy, dangerous, addictive habit and I do not promote the use of tobacco in any form to anyone, ever. I'm pretty sure the good people at ETtBD (or at least their lawyers) would agree.