Travelling alone is not a problem, if you do it in a safe setting. Setting includes a sitter around or not, I guess.. The same setting with or without a sitter can make a big difference in some cases, like this one.

I have smoked next to rivers/waterfalls but I was in a safe position and had a sitter. At the same time I've smoked many times alone in a safe place and had no problem.   But being in a potentially dangerous place without a sitter, that's really a problem, as unfortunately we see here.