Nicotine is a drug found in tobacco and smoking is a legally sanctioned form of substance abuse. If heavy users stop suddenly, withdrawal symptoms occur. Many people who quit relapse within one (1) year. This number is:

A. 30% This underestimates relapse rates. A much higher percentage relapse within the first year. B. 50% Still lower than actual estimates for heavy users. C. 70% Research shows that 70% or more of smokers relapse within a year of quitting without comprehensive support. D. 40% Also lower than real-world data.