New snake behaviour, surprisingly friendly or just normal?!

[Hollie]

Hey people So I got this awesome little ball python for valentine's day, my Patto. I have a wooden 3x2 viv with sliding glass doors, the whole setup including heat lamp, mat, 2 hides, basking rock, water, thermometer etc etc. Anyway so I've only had him 5days or so, we got him from a reliable pet store who said he was about 2 years old and very docile. The day we got him, we brought him home and realised the viv was busted. We made a make shift viv by turning a secure wooden cabinet on its side and putting it by the fire with the door open, we put all his hides and stuff in there and he actually seemed really happy. It didn't have a glass door so we had him out most of the time (our bed is next to the fire next to the viv so he would curl round our necks for warmth and nuzzle our ears.) He never hissed or tried to strike, infact it seemed like he loved being out, he loved going on our heads and exploring our hair. The next day we managed to go back and get the same viv but not a broken one this time :p He loved it straight away, explored all around and made good use of both hides. One night I couldn't sleep so I sat and watched him roaming around, he stopped when I sat and he could clearly see me, I held my hands out flat and he relaxed, he even drank water in front of me like he wasn't threatened at all. I talk to him sometimes and he will nuzzle the glass wherever my head is, almost as though he wants to come out?? The store said he probably wouldn't eat the first mouse we gave him but we fed him a medium sized mouse on Monday and as soon as we put it in he came straight out and ate it right in front of us! This is all new to me but he just seems so friendly I can hardly believe it. And don't be ****s I know snakes can't be 'friendly' but you know what I mean. Anyway these are all good signs that he's settling in and stuff right? I think he got so used to us the first couple of days, we kept putting him into his hide but always just came straight back out to see us. Anyone else had this or is my Patto just amazing? Btw he is almost 2ft long I would say and is a pretty slow mover, all the temps are correct in the viv but he's always just so relaxed. I think he trusts us? Oh another thing, can cigarette smoke/ aerosols harm him? We have a very large bedroom and always have the window slightly open but I worry. Thank you!