My friend want to leave smoking but if he doesn't smoke in intervals of 3 hours he starts sweating n results a severe headache. He also has gained breathing problems due to smoking. He wants to leave this smoking habit. What should he do?

Suggestions offered by doctors on Lybrate are of advisory nature i.e., for educational and informational purposes only. Content posted on, created for, or compiled by Lybrate is not intended or designed to replace your doctor's independent judgment about any symptom, condition, or the appropriateness or risks of a procedure or treatment for a given person.