Because immunity is a vital function of the body, the suppression of any form of flu, cold, allergy, fever (unless it went up above 40 degree), whether by conventional medicine or alternative methods (surprise!), will have permanent consequences in the body.
For example the chronic use of antihistamines to treat allergies will weaken the tissue integrity of the mucus linings of the nasals, and often the long term side effect is chronic fungal sinusitis (sounds familiar?). Thereafter you may be given antibiotics of anti-fungal drugs which in turn lower your immunity via disturbances in the gut flora. This in turn leads to hypersensitivity and you are given drugs again to address the symptoms. Is a repeated cycle.
Even chronic use of ventolin may deplete the body of vitamin D, which is a critical nutrient for immune health.