Do not start with a bar or cookie or drink that has 100mg and try to do a limited dose. Start with products that have 2.5 mg or 5.0 mg per unit. That way you can get more precise dosage. There is a time delay that varies depending on your metabolism, your stomach contents, or your sensitivity to THC. So start with a small dose, like a 2.5 or 5.0 mg, wait about an hour for full effect. If you decide that is not enough, try a little more. If that is too much, then you probably don't like cannabis. The effects will start to wear off after about two hours, but you may still be high for longer as it wears off.
Expect initial euphoria, maybe a little giggly. Your mind will feel a little hazy, and you will likely be easily distracted and forgetful. You will be inebriated, however, so don't drive and be careful moving around, climbing stairs, cooking, etc. Have something to drink at hand, and snacks are always a plus. Choose a relaxed, comfortable environment during a time when you are not likely to be interrupted or disturbed. Music is nice, and sound and colors may seem enhanced. Expect to be ready for a nap afterwards.
There are variables in products you should be aware of. Sativas are a little energizing, like a strong cup of coffee. Indicas are sedative-like, and may make you drowsy and very relaxed. Hybrids are a cross between the two, often leaning toward one or the other. With hybrid, you may start with an energetic euphoria at first, and then settle into a very relaxed state. Some edibles have CDB, which may help you relax or sleep.
Keep in mind that you will not "OD" on a modest dose in a dangerous way. However, some people find the effects unpleasant. If that happens, just wait it out, you will come out of it after a while. You are not in danger, so don't panic.
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