When smoked, the speed should dissolve and then vaporise without leaving a residue, however impurities in the drug may leave a residue.

If you smoke, or chase, buy your own smoking implement or make your own pipe. Glass pipes work better with ice or crystal as they have a tendency (after heating) to reform and re-crystallize as they cool. The effect of smoking ice is very similar to injecting but the process lasts a lot longer.

With smoking, drugs enter the bloodstream after being inhaled and absorbed by the lungs. Smoking anything; methamphetamines, grass, tobacco or heroin is harmful to the throat and lungs as these substances are irritants and can cause serious damage. This can impair breathing, cause coughing, severe upper respiratory tract infection, bronchitis and asthma. It is possible that smoking methamphetamines is carcinogenic (may cause cancer).

Be careful not to get carried away - don't smoke the whole point at once - split your dose and take breaks to monitor what you're feeling. Some drugs, like meth, are stronger than others and can easily get you in a spin. You can really overdo it without knowing.

Also be aware that if your lips are chapped or cracked and you continue to smoke while sharing or passing equipment you could get Hep C. Use Vaseline (or similar) on your lips during smoking sessions to reduce your risk.