Snus is spitless. And your lower gastrointestinal tract can absorb nicotine in saliva that you swallow, so nothing goes to waste!
But ... if you have unpleasant side effects and find they are persistent, then snusing is not for you.
I got an email today that General is introducing the strongest snus ever: 15mg of nicotine per piece. Since I get ill at the 6mg level, I cannot imagine a 15mg snus! OMG.