I chewed for like 2-3 year when i was in the corps. It kept me awake and was a quick jolt of energy. I wasn't doing 2 cans a day, but 1/2 can of Cope Longcut or black a day. I really knew i had to stop when i saw my gum lowering compared to the other side. My SSgt, who chewed 2-3 cans per day had to go in for an x-ray or something to get checked out for cancer. His lip look mutated from all the chewing.

Seeing all that, plus seeds helped. I carried seeds on me all the time when i stopped. I'd pack'em in my cheek like redman.