To keep in mind - if you commit an offence, are detected and punished in any way, you will lose visa free travel to most of the world and access to a a lot of it. You’ll have to tick the yes box on forms that ask if you have been convicted of an offence and that means applying for a visa and providing documentation of the offence. Whilst the substance may be innocuous to you (and maybe many others) having a drug offence is going to be instant refusal of entry to a lot of the world.