Smuggle? Needles are perfectly legal to have on flights in the US. As are small scissors. I knit on flights all the time.
You can check restrictions for crafting items by googling them and the country you are flying to/ from to be sure of exactly what is allowed.
I fly with my small crane scissors and knitting and crochet needles all the time. Cross stitch needles are smaller and perfectly acceptable in the US and most of Europe is my understanding.