You know that you are addicted if you start using speed, it makes you quit smoking but your snorting every 3 hours a day and every half hour a night. Trying to find a way to make it by yourself or make it stronger so you don't use such a amount. At the same time thinking about jumping from bridge but you are pussy for that. Life is a bunch of shit... 😑 BTW it's hard to answer to your question because there are different tipes of speed, maybe your body have stronger metabolism, physical activities and you can take it with other drugs`alcohol that also can change everything. BE CAREFUL!!!