Recurrent canker sores for the past month?

Since July I’ve had 3 separate occurrences of these sore. The first time was only sore but the last 2 times there been 2 next to each other. I usually use hydrogen peroxide and alum. This last time I’ve used HP everyday and alum only twice. But today when I went to use HP the canker sores started to bleed. That’s... show more Since July I’ve had 3 separate occurrences of these sore. The first time was only sore but the last 2 times there been 2 next to each other. I usually use hydrogen peroxide and alum. This last time I’ve used HP everyday and alum only twice. But today when I went to use HP the canker sores started to bleed. That’s literally never happened. They don’t burn or hurt, I actually forget they’re there, but the bleeding really freaked me out. Also, the last 2 days I started smoking a cbd vape pen. Could the vape be irritating the sores? Please help.
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