Why would you conclude that? She only mentioned alcohol and tobacco.
So, do you concede that marijuana, alcohol, and tobacco are gateway drugs?
I didn't quote her, but another portion of the article about pleasure receptors (which AFAIK every drug stimulates) in support of my statement ... so why are you misleadingly asking about what she said?
So, do you concede that marijuana, alcohol, and tobacco are gateway drugs?
If this research is correct, some portion of the "gateway effect" of marijuana, alcohol, and tobacco is neurochemical. What of it?