Could you tell me what are likely leads to/risk factors of/for aneurysms and embolisms?

See below: Hypertension, diabetes, smoking.

See below: Aneurysm - smoking, high blood pressure, family history, age. Embolism - heart rhythm abnormalities, blood clotting disorders, obesity, major surgery, immobility.

Several: Aneurysms: few are congenital and some genetic with Marfan and tissue disorders. Rare syphilis anymore. Most are atherosclerotic and wall deterioration with some theories evolving. Emboli can be arterial or venous in origin. Clots from coagulopathies, stasis, trauma may move! some other emboli are atherosclerotic plaque, air, amniotic fluid , platelet aggregates.