Answer:
1. Chewing tobacco
2. Dip
3. Smoking tobacco (cigarettes, pipe)
4. Cigars
5. Snuf
6. Most recently, smokeless tobacco (which really just contains nicotine)
As far as brands of products go, for both smoking and roll-it-yourself tobacco, there are:
305's
1839
ACE
Alpine
American Bison
American Harvest
Amphora
Amsterdam
Ashford
Bali Shag
Bama
Baron American Blend
Basic
Benson and Hedges
Black & Gold
Bo Browning
Bristol
Bronson
Bugler
Bull
Cambridge
Camel
Canoe
Carlton
Capri
Carnival
Charles fairmorn
Checkers
Chesterfield
Cheyenne
Cigarettellos
Classic
Classic Canadian
Commander
Competidora
Custom Blends
DTC
Danish Export
Dave's
davidoff
Decade
Desperado
Direct Buy
Director
Doral
Dunhill
Drum
Echo
Eclipse
English Ovals
Eve
Export A
F & K Fine Cut
Fantasia
FG Value Brand
Farmer's Gold
First Class
Fortuna
Fresh Blend
Fresh Choice
Gambler
Gold Coast
Gold Crest
Golden Virginia
GPS
Grand Prix
Havana Ovals
Hint Menthol
Hi Val
JED's
Jester
Kamel Red
Kent
Kentucky's Best
Kentucky Select
Kite
Kool
L&M
Lark
Liggett Select
London Export
Lucky Strike
MCD
Malibu
Manitou
Market
Marlboro
Maverick
Max
McClinktock
Merit
Midnight Special
Milestone
Misty
Monarch
MontClair
More 120
Nashville
Native
Natural
Natural American Spirit
Newport
New York Cut
Norwegian Shag
Now
Ocean
Old Glory
old Gold
Old Hillside
Our Advertiser
Palermo
Pall Mall
Parliament
People's True Taste
Pinson
Premier
Players
Pulse
Pyramid
Fine Cut
Rave
Roll Rich
Romy
Rumba
Salem
Samson
Saratoga
Shield
Signal
Smoker Friendly
Smokin Joes
Sonoma
State Express 555
Stockholm Blend
Sundance
Tareyton
Teton
Top
Treasurer
True
Turkish Export
Union
USA
USA Gold
US-One
Ultra Buy
VB Made in USA
Van Nelle
Vantage
Virginia Slims
Wave
West
Wildhorse
Wings
Winston
Zen
Zig Zag