My believe is that a single person cannot be addicted to gambling and drug at the same time. And why I believe so is that addiction can only be replaced by another, because even if a gambler is also doing drug, that doesn't mean that he can be addicted to both since he will only be more loyal to one.
I stand to be corrected, but the reason I created a thread about this is to hear of the opinion of others, so what's your take on this?
Of course, they can. When it comes to addiction, there's no such thing as loyalty; a person can be addicted to drugs and pornography, or gambling and alcohol, as long as the body and mind can take it, it can form a habit to accommodate these addictions, and there are a lot of studies that can prove that also.
And there was a time I was addicted to gambling and smoking, and I could do these two things together.