That's a good question, Dinonykos. There is no official mention of tobacco or any other drug with the exceptions of beer/ale and wine, and maybe spirits (hard liquor).
But, in the great Tolkeinian tradition, Elminster smokes a pipe quite regularly and I believe others occasionally pick up a pipe.
It is quite possible that there are traditions of smoking that develop from the shamanistic use of certain plants (the way tobacco smoking started on earth), or by accident such as a house catches fire and the plant with the pretty lavender flower burns up and smells good and makes the inhaler feel "better".
As for shaved heads, you bring up an excellent point, Dinonykos. There are many men who do not look good with a shaved head. The first person that comes to mind is the lead singer of the band Midnight Oil. His heas isn't 'round' enough. I don't want it to be a circle like Charlie Brown, however.
The other class that pops to mind are the guys whose necks are as big or bigger than their heads, which includes but is not limited to, pro wrestlers, football players and overweight old men riding around in little electric carts at the super market.
