Burn Notice question

I finally cracked and bought the whole 4 seasons of Burn Notice and I noticed one thing. The brand of cigarettes Maddie smokes is the same one that Cigarette-Smoking man was smoking in The X-Files (Morleys). So my question is : Is Burn Notice set in the same universe as The X-Files ?

No, but it is common for shows to use pretend brands that have been used in other shows. Other commonly used brands are Spyder-Fynder for web search and the airline company used in Lost (Oceanic, I think).