By skin-to-skin contact
(handshakes or hugs).
By touching a contaminated surface (blanket or doorknob).
Endocrine gives the correspondence through hormones; secrete their hormones directly into the bloodstream and uses blood vessels as information channels. ... Theendocrine and integumentary systems correlate with the sense organs, which react to heat, cold, vibration, texture, and pressure.
D smoking damages cilia in the trachea and more particles enter the lungs
The person you are sharing them with may be sick or have something and by sharing those they could pass it onto you
