I'm in the main camp, that helping an addict avoid the consequences of their actions isn't helpful, because less pain equals less incentive. Common sense must apply though, for instance helping with something constructive could be classed as encouragement or even reward.
My DIL disagrees with me. She's had her issues with drugs, and says my son's support helped her recover (she's been clean for 8 years). I think the difference is she was really sorry about her last lapse and determined to recover, and his help reinforced her own desire.