Most ex-smokers are concerned about unwanted weight gain after quitting, but making sure to modify your diet can help to eliminate nicotine cravings when reducing weight gain. Your diet and other lifestyle factors can also help stop you from relapsing into smoking again. Consult your doctor and a registered dietitian before you make any changes to your eating habits.
Nicotine is what makes smoking addictive for smokers: it is the chemical in the leaves of the tobacco plant that makes cigarettes so addictive. It is present in all cigars, smokeless tobacco (such as chewing or snuff), most electronic cigarettes, nicotine gum, nicotine patches, and nicotine lozenges.
A growing body of independent global evidence and assessments from internationally recognized professional bodies and medical institutions indicate that safer nicotine products and nicotine pouches are safer than any combustible tobacco. The evidence suggests that nicotine products play a role in reducing smoking-related smoking-related disease and death. Tobacco harm reduction is an intervention that has the potential to save millions of lives worldwide.
The answer is no, nicotine does not expire, at least not in the way that milk does. Unlike milk, nicotine does not smell or taste rancid or go bad. It will still look fresh, and taste good, but it will no longer have the same potency level as when it was purchased.