Do they check bags that are going down the shoot? Or just hand luggage? Because I'm 16 and I'm going from the UK to Italy with my nan and she knows I smoke but I think she thinks I have quit. Mainly because I've never smoked infront of her even after she found out as I feel it's disrespectful to smoke infront of her, but anyway, so I'm going over with my nan and planning to take 2x50g of backy and don't want them to check my bag for it to become a surprise for her. 
Or even if I was to still put it in my hand luggage would they say anything about it?
Also where do I put my lighter? Because surely it would pop under the pressure?