Zyn 3mg vs. 6mg cost effectiveness

Am I dumb for usually buying 3mg? I sometimes do 6 but adverse effects hit me a bit harder if I do. I pop my 3s over the course of the day, but not 2x as many as if I were doing 6s, so net nicotine intake is lower. But we do this for the nicotine, and 3s and 6s cost the same. Should I just try to do a little less 6s and get more bang for my buck?