If you chew, and want to quit, I highly encourage you to check out Stonewall. (I recommend the Java flavor Stonewall, Ariva would probably be too weak for you.) As a chewer, and not a smoker, you’ll be a natural fit. I used Stonewalls and ecigs (and a little Swedish snus) to quit smoking, but Stonewalls and/or possibly snus would probably be perfect for you.
Look up the type of chew you use here, and compare the total nitrosamine levels between that and Stonewalls. (Everybody else should also check out that link if they want a cite for my previous assertions.)
If anybody needs help finding the best online sources to buy them, (or for any other questions) feel free to PM me. (No, I have no financial interests in this and am not trying to sell you anything.)