I also had the same question in my mind and then asked few scholars and googled to know the fact. Same with the case of smoking. These are not directly mentioned in Quran or Sunnah, so scholars explained the matters in question with their own understanding basing on other things similar, and their ideas differ. So it is you who will stand in front of Allah (swt) with your own deeds. So to me, it's better, you form your idea basing on what others have said. and know that, it's always better to remain in safe (if you really fear Allah and Judgement day).
Al-Hasan bin 'Ali said:
"I remember that the Messenger of Allah (s.a.w) said:
'Leave what makes you in doubt for what does not make you in doubt. The truth brings tranquility while falsehood sows doubt.'" [Jami` at-Tirmidhi Vol. 4, Book 11, Hadith 2518]
So,the idea that I thought to be more logical and perfect is "HAARAM".
The evidences attributed to my thought are given below:
"Whoever plays with dice (cards- anything that is shuffled to wish for desired ones), would (resemble) one who has tainted his hand with the flesh and blood of a pig," narrated by Muslim (2260).
"Everything other than remembering Allah is (considered) wasteful play except four: a man humoring his wife, a man training his horse, a man walking between targets (learning archery), and man learning swimming," narrated by An-Nasaa'i and authenticated by Al-Albaani (Sahih Al-Jami' 4534).
"And of mankind is he who payeth for mere pastime of discourse (idle talks, singing, playgirls: many tafseers have various ideas about it but basically time wasting device/event is the main crux), that he may mislead from Allah's way without knowledge, and maketh it the butt of mockery. For such there is a shameful doom." [Surah Luqman 31:06]
"What has caused you to enter Hell? They will say: "We were not of those who used to offer their Salat (prayers); Nor we used to feed the Miskin (poor); And we used to enter into vain discourse (idle talks, talking falsehoods, vanities, etc) with those who engaged [in it]" [Surah Al-Muddaththir 74:42-45]