Hi'\Welcome to Hcm,
first of all,smoking
is always injurious to health and besides lung cancer
and coronary diseases known to affect arteries in lower limbs
leading to ischaemic limbs .
In that way may be you are right blaming the smoking .
It seems you are too worried . It is advisable to consult surgeon and get a check up and discuss yous problem .
It is unlikely that you are having less sex drive for one testis poor function.
It is not possible to measure blood flow by palpation only unless there is gross arterial supply deficiency or venous problem .
too much worry also diminish sex drive .
it is better to go for a consultation and get the tests done and get proper treatment if at all needed .