Agobio translates to 'overwhelm' or 'burden', but it carries a strong emotional weight, describing a feeling of being suffocated or distressed by a situation or person.
In the song, the artist sings, "cerca tuyo me agobio" (near you I feel overwhelmed/burdened). This word perfectly captures the complex, suffocating feeling of being close to someone you have a tumultuous relationship with, highlighting the internal conflict between love and resentment.
"Un Cigarro" opens with Sael trying to sound like the reasonable one: "Yo quiero saber si tú me quieres" [I want to know if you love me]. Two lines later he's already talking himself out of caring: "En la calle se consiguen más mujeres" [there are more women to find on the street], the kind of line a guy says before he actually believes it. The hook gives up the act: "Que te amo y te odio" [I love you and I hate you], "Que quiero estar contigo, pero solo en la cama" [I want to be with you, but only in bed].
The title line is the whole trick of the song: "Un cigarro y te vas de mi mente" [one cigarette and you're gone from my mind], a smoke break sold as a cure that never actually works. Two lines later he's already wrong again: "Pensé que tú eras diferente / Pero me volví a equivocar" [I thought you were different / but I messed up again]. The second verse has him replaying a night they spent together, "Recordar lo que borrachos hicimos la noche de ayer" [remembering what we did drunk last night], swearing he won't pick up if she calls. Then the song ends on one word that undoes the whole performance: "¿Aló?" [Hello?]