Apply to skin every day. It releases a steady dose of nicotine through skin. Very easy to use and has very few side effects. Releases nicotine more slowly than other systems. It can cause skin irritation and vivid dreams.
Replacement patches less expensive.
Delivers nicotine the fastest, good at reducing sudden cravings. Nose and sinus irritation common at first, but usually subside. Those with allergies or asthma should not use. Use for 3 months. Few side effects.