Some science behind the scenes
Boosting is the name given by ‘recreational’ drug users to the taking of an additional dosage of a substance part way through the experience. Most commonly this is done with a lower dose the second time which can be taken at any point, including before the peak, during the peak, soon after the peak, or just before the effects of the first dose would start to wear off.
If you look at the advice given by most websites, they tend to treat this as normal and perfectly safe. But it is not. One of the side effects of 'recreational' drugs is that you temporarily lose your reason. So you cannot make any reasoned judgement about doses whilst you are in the process of having the experience. You may also have your memory affected, which may well mean you forget how much you have taken already.
In my humble opinion, it is better to wait until the experience is over, assess the effects and after having waited for a reasonable time to let the drug exit the system [days not hours] decide what to do in the cool light of reason and memory returning.
As one of the more responsible websites says “stick to your plan and remember that redosing when high increases risks of medical problems and hangovers. Life is long, you'll get another chance, be patient”.
The Hasheesh Eater – Fitz Hugh Ludlow
A rapid glance showed most of [the drugs] to be old acquaintances.
‘Conium, taraxacum, rhubarb – ha! What is this? Cannabis Indica’.
‘That’ answered the doctor, looking with a parental fondness upon his new treasure, ‘is a preparation of the east Indian hemp, a powerful agent in cases of lock jaw’.
On the strength of this introduction, I took down the little archer, and removing his outer verdant coat, began the further prosecution of his acquaintance. To pull out a broad and shallow cork was the work of an instant, and it revealed to me an olive brown extract, of the consistency of pitch, and a decided aromatic odour. Drawing out a small portion upon the point of my penknife, I was just going to put it to my tongue, when
‘Hold on’ cried the doctor ‘do you want to kill yourself? That stuff is deadly poison’
‘Indeed’ I replied ‘no, I cannot say that I have any settled determination of that kind’
and with that I replaced the cork, and restored the extract, with all its appurtenances to the shelf…….
… the doctor was both right and wrong; right inasmuch as a sufficiently large dose of the drug, if it could be retained in the stomach, would produce death, like any other narcotic, and the ultimate effect of its habitual use had always proved highly injurious to mind and body; wrong, since moderate doses of it were never immediately deadly, and many millions of people daily employed it as an indulgence similarly to opium.