source:
https://drugaware.com.au/meth-help-tool/safer-use/#How-much-and-how-often-do-you-use-Harms can relate to the drug’s effects, method of use, risk taking and situations in which people use meth, or to the pattern of use.
There is no completely safe way to use meth. Using meth increases the risk of stroke and heart attack along with other serious harms to health. The only way to avoid meth-related harms is to not to use at all, but for people who choose to use, the following harm reduction strategies may help to reduce the risks of a range of potential harms.
Want to know more? Take the source link above. Here is an excerpt:
Tips to reduce the risks* Try to use with a trusted person or group, so they can keep an eye out for you in case something goes wrong.
* Some methods of use have a lower risk of blood borne virus transmission, snorting or swallowing your drugs can be a safer option.
* If smoking meth, it is important to fully vaporise the meth. This will mean you are not inhaling liquid, which is harmful to your lungs. For this reason, consider using a jet lighter.
* If injecting, use new injecting equipment every time and use correct swabbing and filtering techniques. If you do choose to re-use your equipment, make sure it is cleaned as best as you can.
* Don’t share smoking or injecting equipment even if you know the person well. Even if you both have Hepatitis C, you may have different strains/genotypes, which could mean you get a new infection if you share equipment.