A. Deal with your respiratory problems. You probably do it because your nose itches because it's low grade infected all the time.

B. Deal with your circulatory issues. Hands, feet, nose and ears get shorted first when you have circulatory issues.

C. Pick your nose in the shower while your hands are clean before sticking fingers in your nose and can be promptly recleaned afterwards without contaminating anything else. You probably have that nasty habit mentioned in another comment because of low grade chronic sinus infections. Mucus firms up like cement to trap stuff, at which point picking your nose makes more sense than blowing it.

D. Get better salt in you and stay adequately hydrated. Both salt and water are major components of mucus and mucus is your respiratory system's first line of defense against invaders.

E. Don't know how to fix your health issues? Try fasting. It likely frees up immune cells to address other issues while your gut is empty of pesky foreign invaders brought in via the food you eat.

F. While addressing all that, have something you can fiddle with to occupy your hands so they are doing something else. Let me recommend that your fiddle stick/toy/thingamajig be made of copper or silver because they are both antimicrobial.

G. You may also need to up your environmental hygiene. Dust everything or get rid of nasty carpets, etc.

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