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The studies that are available, however, tend to show that while vaping may be slightly less destructive to the lungs than traditional smoking, there are still harmful chemicals in e-cigarette fluid

Dont use it first thing in the morning or late at night

Nicotine and Tobacco Research 6(Suppl 3):S363-S369

Therefore, vaping results in diacetyl going directly into the lungs

Cycling typically wouldnt lead to muscle mass loss because it is a muscle-strengthening cardiovascular activity, especially for the lower body, but to avoid losing muscle mass from cycling, you should incorporate strength training into your routine