Could i be addicted to cocaine if i held a bag tht some1 else did?

I out with mates and 1 of thm (an idiot) took a "line", after he took it about 20secs later he handed me a scotsmid bag, am paranoid tht i could get addicted from touching the bag , whn i got home i my pupils were normal, (a little bit big) i dont have an creavings for it but i cant stop thinking about i may be addicted mainly coz am a worrier