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I was thinking why Space Marines has turned into Chaos side, you know tentacles and other grows on faces and body aren't very convincing, but recently I've seen Bioshock.
There was idea with drug allowing people doing incredible things, giving them power, so much people got addicted.
Could it be the same with Space Marines? And another question: why all Marines in Legions given up(ofc besides some splits(look DA)).
Why every single one has fallen, there were no doubts?
Do everything for our Primarch? But wheres Emperor?
And why it's better to be loyal to Primarch than to Emperor?
Are you loyal to power, the Chaos gave you? Is it really the power turned SM into CSM?
Share your thoughts, dispel doubts.

Not every single member of the Chaos Legions turned during the Heresy. Most, if not all, of the ones who didn't were killed by the traitor legions at Istvaan III. I have no idea what the rest of your post is asking.

1.) If you're asking if it's possible for SM to fall to Chaos due to a drug addiction, then most likely no. They could, however, fall to Chaos due to addictions to other things. Such as drawing upon the Warp if they were a Psyker or becoming addicted to slaughter like the World Eaters.
2.) As mentioned, previously, not every marine in every Traitor Legion actually turned traitor and were killed either before or during the Istvaan incident.
3.) To the extent of my knowledge, none of the legions turned traitor because their Primarch woke up one day and decided Chaos was cooler. It was a gradual decent into Chaos fueled by tensions among the Primarchs and the Emperor, as well as the Primarchs individual flaws and insecurities. Most of these were passed down to their Legions either through the traditions instituted by the Primarch (such as the World Eaters making use of the Butcher's Nails) or how they were deployed during the Crusade (such as the Iron Warriors being the go to Legion for sieges, when they would have preferred to be building fortresses rather than tearing them down).
4.) The reason why the traitor marines sided with their Primarchs over the Emperor probably had a lot to do with them feeling a tighter kinship with their Primarch than the Emperor.

I think his point was that the power is what turned them, they got addicted to it. So they fell to chaos to get a bigger power high.

Given the indoctrination marines undergo, this is actually a good argument for why they would fall. They've lost most of their desires, except to do glorious battle or exercise military power. Chaos tempts them with more of that than they can imagine, so its a real temptation.

I could easily see someone falling to Slaanesh via drug addiction. As for a Space Marine? That better be some of the purest Cocaine imaginable, if you want a SPACE MARINE to get addicted to it.

 dusara217 wrote:
I could easily see someone falling to Slaanesh via drug addiction. As for a Space Marine? That better be some of the purest Cocaine imaginable, if you want a SPACE MARINE to get addicted to it.

I think according to the SW books, marines can willingly shut down their ability to process toxins. I know SW do something like that when they get drunk. They also basically drink gasoline.

 gwarsh41 wrote:

 dusara217 wrote:
I could easily see someone falling to Slaanesh via drug addiction. As for a Space Marine? That better be some of the purest Cocaine imaginable, if you want a SPACE MARINE to get addicted to it.

I think according to the SW books, marines can willingly shut down their ability to process toxins. I know SW do something like that when they get drunk. They also basically drink gasoline.

I've read that Fenrisian Ale is just that strong.

But then again it's not like GW fluff always had consistency.

I think there's a drug in it that shuts it down rather the Marine controlling it.

pm713 wrote:
I think there's a drug in it that shuts it down rather the Marine controlling it.

It just depends on the author