No - it just seems common sense.

Over half the legal immigrants to this country over the last 5 years are not EU citizens.  Membership of the EU is therefore irrelevant with regards to that group.

The 'out' campaign are keen to point out that students from the EU will be encouraged to attend our universities and colleges - that a point system will be in force for higher educated potential immigrants, doctors, nurses, teachers, engineers etc.  That exemptions will be made for entry by those working in the 'care', agriculture, building sectors and also probably the hospitality sector.  Every time a spokesperson is challenged over how a particular industry would manage without immigrant workers there is a fudge or total failure to answer the question.

So even if we don't join the single market after an exit vote, (which would require the free movement of EU workers), a large proportion of those coming to this country from the EU nations for employment or education would still be able to gain entry.

But the elephant in the room is illegal immigration or more relevantly illegal workers - they contribute nothing to the Exchequer, they are a health risk as well as driving down the earnings of the low paid.  There is no doubt in my mind that exit from the EU will make control of our borders more difficult - we have an open border between Eire and Northern Ireland that would need resources to control - if Scotland leaves the UK and joins the EU ther is then yet another open border.  

Cooperation with the French to prevent illegal immigrants from crossing the channel would suffer.

An even simpler reason to be sceptical of the Brexit campaign is the blatant lie written large on the side of the Boris Battle Bus - "We send the EU £350 million a week" - No we don't - simples - so how do you explain that lie?