For a German Pentecostal alcohol and smoking is forbidden , maybe is not the best , but I want to know is this Biblical ? How can this kind of things destroy your relationship with Jesus ? I come from a very extremely conservative Church , wearing of a simple hand watch is a problem , and engagement rings .
For an American Pentecostal, the same rules apply to one level or another. The Assemblies of God tends to be a Bit Liberal (but in the past were VERY legalistic about it), while the "Oneness Pentecostals" are STILL VERY "Clothesline Holiness" oriented, and VERY Legalistic about it - including Personal jewelry hangups.
There's some controversy about the "Why" of it. There's no question that being DRUNK isn't a good thing, particularly if you Drive drunk - and SMOKING is likely to lead to physical complications.
But - Having a Cold Beer after working outside in the summer, and it's relaxing time, Is a Good thing, and a Cognac after Dinner is a blessing. In Germany I'd often have "Kalte Gerichte" (a cold plate with Wursts, Cheeses, and breads - some assembly required) and wash it down with "Grog" (a cup of hot water with sugar and a couple of jiggers of Dark Rum). Delicious!!!
HOWEVER the REAL issue is two-fold, and Romans 14 is a good general source (although it deals with "Meat offered to Idols").
FIRST THING -
IF your FREEDOM hurts or offends somebody, and destroys your TESTIMONY to them - then DON'T DO IT - you wouldn't be moving in love toward them!!! THEY may think something is WRONG, but maybe do it anyway - because YOU did against their own conscience. As Rom 14 says
Whatever you CAN'T DO IN FAITH - is SIN for YOU if you do it anyway.
Christians (who are "Strong in faith") Shouldn't Lead Weaker (overscupulous) Christians into what would be SIN for them.
Simple as that.
I can have a beer, or a Grog at home in private in COMPLETE FAITH that it's O.K. for ME to do so. BUT I wouldn't bring a 6-pack of Coors to the potluck down at the Assembly of God church. Particularly since I'm a Deacon there - (Duh!!)
SECOND THING - Both Alcohol AND Smoking are generally ADDICTIVE, and ANYTHING that is "Addictive" is a violation of the FIRST COMMANDMENT (NO OTHER Gods before ME!!!).
Lucky Strikes were my "god" (three packs a day - @ $0.35 a pack) for well over a decade, and I served that "god" with a dedication that was ABSOLUTE.
Folks tend to drag out 1 Cor 3:16,17 (Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you? If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are). but that's a passage for the protection of the CHURCH against those who would defile it, so not really Applicable.
"Obsessions", and "Addictions" are PRIMARILY First commandment issues.
When I finally STOPPED smoking (COLD Turkey, and completely through God's power, since it was IMPOSSIBLE for me to do it), I knew (And know today), that I can NEVER light up again - I'm STILL a nicotine addict - I just didn't light up today (for the last 45 years).
On the OTHER hand - Since I'm NOT one who's in danger of being addicted to Alcohol, or alcoholic beverages, They're not an issue for me one way or the other, and the ONLY reason I would "Abstain" would be testimonial, as noted above.