Generally.. no.
Mental illness commonly leads to drug abuse which we can include alcohol abuse.
In my case, it was at least 8 years between the 2, there is no link. It did not cause me to seek out drugs as an excuse etc. You can think what you want, and from reading your previous postings, you are an anti-drug zealot, which is fair enough. But you are commenting about something you don't know. I have first hand experience about both and they are 2 completely different feelings.