I Quit Smoking (5-6 Cigarettes A Day) 2 Years Ago.

I quit smoking (5-6 cigarettes a day) 2 years ago. Since then I’ve used nicotine patches, almost every day for 2 years I’ve used 7mg patch. How dangerous is this? I know it’s healthier than smoking but I’m starting to worry about the length of time I’ve been on them and how it’s affecting my body.