Experts think the toxic chemicals in smoke can damage the DNA in hair follicles and generate cell-damaging free radicals as well.

专家们认为香烟中的有毒化学物质灰损害毛囊中的基因，同时产生破坏细胞的自由基。

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I just wanna go back to my cel, cause in my cell, I can smoke.

我只想回到我的牢房内，因为这样我才可以抽烟。

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Products made by a gene called NRF2 normally protect cells from environmental pollutants like cigarette smoke and diesel exhaust by absorbing the materials and pumping them out of the cell.

由NRF2基因表达的产物通常通过吸收和泵出细胞的方式，防止香烟及柴油废气等环境污染物对细胞的损害。

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"The failure rate was higher than predicted as part of the certification process and the possibility that a short circuit in a single cell could propagate to adjacent cells and result in smoke and fire must be reconsidered, " said Deborah Hersman, the head of NTSB.

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