Another detail that supports the argument that this song is (at least partially) about drugs is the reference to the "warm smell of colitas".
"Cola", in Spanish, means tail. "Colita" is the diminutive form of "cola". It is probably a reference to the buds of the marijuana plant. These have the highest THC content, and are therefore most desirable for smoking. This makes even more sense when taken in the context of the "warm smell".