I will go to the grave drinking water, milk, tea, juice, and Wild Cherry Pepsi. I will also go to the grave being extremely pale. This, my friends, is why:

ALCOHOL
In the first experiment of its kind, 15 volunteers quickly drank the alcoholic equivalent of three beers through straws as their brains were scanned. Six minutes after doing so, the magnetic imaging began to show chemicals that are meant to protect brain cells disappearing.

As the drinking continued, more components of the brain cells were cut off. Luckily, when the volunteer’s brains were scanned the next day everything was back to normal. Scientists warn this probably isn’t the case with chronic drinkers. (source)
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TANNING BEDS
An analysis of 20 studies has resulted in the WHO classifying the sun bed’s ultraviolet rays as a “definite cause of cancer.” This label is also reserved for such scary things as tobacco, hepatitis B and being a chimney sweep.

More specifically, the studies show that regular use of a tanning bed increases the risk of skin cancer by 75% in those under 30.