It will likely take time if your actions are to have that kind of impact on the substance abusing person. In their fear, they might even try to persuade you not to get help for yourself by threatening you, manipulating you or even promising to get help themselves. There may be no follow through on their part. Do it anyway but do it for the right reasons. Do it, not to get your loved one to get help, but do it for you. The results may pleasantly surprise you.