Thana
Lady
What could have been god's purpose in creating addictive drugs such as nicotine, alcohol, heroine, cocaine, etc?
And if they serve some reasonable purpose why make humans vulnerable to them?
I don't know, I'm not God, I can only speculate. I imagine it has something to do with variety and free will, Not to mention that these drugs/alcohol can have medicinal benefits and have contributed to world-changing events and world-changing people. For example, Wasn't Frued himself a coke fiend and didn't he say that it helped him come up with the things he did? And that's not to mention all the artists out there.
Also I think you're forgetting that alcohol and drugs are very much choices that people make. We're masters of our own destruction, not God.