Not to panic you but i've heard often enough of people having HPPD specially after 2-ct-7 use.
Do NOT consume it without properly weighing. Get a mg scale or dont do it.
Check erowid page on it, and the
overdose warning. Start with very low doses!
While we can talk about RC in the nexus, its really not our focus, and we discourage excessive discussion on them. RC involve purchasing from unknown suppliers and risk of mislabelled batches or toxic impurities, their health effects arent really known either, it attracts bad attention to our community, etc etc... I suggest not doing it and going for other safer substances.