Crystal Shatters

Crystal meth lowers your inhibitions, which is why many users have unprotected sex. With it can come HIV, hepatitis and STDs such as syphilis. It can also cause memory loss, chest pains, irregular heartbeat, abscesses all over the body, soft tissue infections, excessive weight loss, tooth decay, and impotence (also known as "crystal dick").
That's just the physical part. Crystal breaks your psyche too, increasing feelings of fear and anxiety. It is common for users to experience chronic depression, paranoia, temporary psychosis, impaired decision-making, loss of the ability to feel pleasure, isolation, and obsessive behaviors. For all these reasons, chronic crystal meth users risk losing their jobs, money, homes, and personal relationships.

While crystal meth will make you feel good at first, when the high wears off the crash can be long and excruciating. To avoid the pain and despair of the crash, users may turn back to using crystal and soon become addicted.