Typically, medications and over the counter products are designed to help with withdrawals when quitting smoking. Even though people typically start smoking again because of stress the withdrawals can be uncomfortable and for some start smoking to feel good again. Typically you may have to deal with dullness, restless nights, anxiety, feeling tense but you are not going to shake violently or foam at the mouth. You just need to hang in there.
Still quitting smoking cold turkey is not for everyone and the whole point is to QUIT SMOKING. How you do it is up to you. Check out more on getting help to quit smoking and the different options available to you.