Chiming in from the US re: customs. (I am NOT ordering or considering ordering N). I do order cigarettes from out of country, and for the last decade, it had been pretty much fine with customs (and they would reship me if anything went wrong). However, in the last 3ish years, it has been an utter nightmare. Pretty much not one of dozens and dozens of orders got through. This is the same case for my other family members who also order cigs online from out of the US. Customs has sent me letters. They have seized all shipments. I am still trying b/c the sites claim they are working on the issue, so I will see if they have improved it.
I think what is happening is that customs knows what the packages look like and just takes them all. The same could be the case for N if it is a common thing people try to get through. I am just speculating here, but all my family members have the same issues, and it seems they are purposely taking the packages in customs because they can spot them now.
Edit to say: the black-and-white turning point with customs began in winter of 2014. In Feb. 2015, I began to have serious issues and got some letters, and since then pretty much nothing goes through. Maybe they have some new thing that helps them spot the packages or just cracked down real hard. But NOTHING goes through since then.