Court has upheld as constitutional sentences that look equivalently severe.” Jones, 674 F.3d at 95-96 (citing Harmelin v. Michigan, 501 U.S. 957, 111 S.Ct. 2680, 115 L.Ed.2d 836 (1991) (upholding a sentence of life in prison without parole for possession of more than 650 grams of cocaine)). Confronted with this precedent, we cannot say that imposing a life sentence on Mercado-Cruz for similar drug possession and distribution ' charges violated his Eighth Amendment right to be free from cruel and unusual punishment. c.Error in Drug-Quantity Determination Mercado-Cruz argues that, at sentencing, the drug quantity attributed to him was not supported by proper findings related to his personal involvement in the conspiracy. See United States v. Colón-Solis, 354 F.3d 101, 103 (1st Cir.2004) (<HOLDING>). That argument is inapplicable here because
holding that when a district court determines drug quantity for the purpose of sentencing a defendant convicted of participating in a drugtrafficking conspiracy the court is required to make an individualized finding as to drug amounts attributable to or foreseeable by that defendant holding that where the indictment charged drug quantity but drug quantity was not submitted to the jury the district court erred in using drug quantity to increase the penalty beyond the twentyyear maximum of  841b1c holding that in certain circumstances where a defendant is convicted of a charge alleging a conspiracy to distribute one drug or another he must be sentenced as if the conviction were only for a conspiracy involving the drug that triggers the lowest statutory sentencing range holding that in order for a trial court to determine which of the three graduated penalty subsections of 21 usc  841b applies to defendants convicted of a  846 drug conspiracy the jury must be instructed to determine the threshold quantity of drugs attributable to each conspiracy defendant on trial holding that a defendant who stipulated his drug amounts prior to sentencing waived his right to appeal on the issue of the drug amounts