Smoking
Lighting up has been linked to an increased risk of developing psoriasis and other skin conditions. If your relatives also have the disease, you are nine times more likely to develop it.
Smoking is also shown to make it harder to get rid of the symptoms and known to interfere with different treatment options. It is closely linked to pustular psoriasis, a head-to-treat type that affects the soles of your feet and the palms of your hands.